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1230806780 = 22578791477
BaseRepresentation
bin100100101011100…
…1001111011111100
310011202222110111022
41021113021323330
510010041304110
6322044243312
742333453650
oct11127117374
93152873438
101230806780
11581838395
122a4240538
13167cbc748
14b966ca60
15730c3755
hex495c9efc

1230806780 has 24 divisors (see below), whose sum is σ = 2953936608. Its totient is φ = 421990848.

The previous prime is 1230806779. The next prime is 1230806803. The reversal of 1230806780 is 876080321.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 1230806780.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4395599 + ... + 4395878.

It is an arithmetic number, because the mean of its divisors is an integer number (123080692).

Almost surely, 21230806780 is an apocalyptic number.

1230806780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1230806780 is an abundant number, since it is smaller than the sum of its proper divisors (1723129828).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1230806780 is a wasteful number, since it uses less digits than its factorization.

1230806780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8791493 (or 8791491 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 1230806780 is about 35082.8559270764. The cubic root of 1230806780 is about 1071.6754779457.

The spelling of 1230806780 in words is "one billion, two hundred thirty million, eight hundred six thousand, seven hundred eighty".

Divisors: 1 2 4 5 7 10 14 20 28 35 70 140 8791477 17582954 35165908 43957385 61540339 87914770 123080678 175829540 246161356 307701695 615403390 1230806780