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28133538720 = 253579299013
BaseRepresentation
bin11010001100111000…
…111011101110100000
32200121200012211211120
4122030320323232200
5430104141214340
620531355212240
72014114063530
oct321470735640
980550184746
1028133538720
1110a27716051
125551a47080
1328647a5141
14150c5d14c0
15ae9d434d0
hex68ce3bba0

28133538720 has 192 divisors, whose sum is σ = 101401009920. Its totient is φ = 6422888448.

The previous prime is 28133538661. The next prime is 28133538737. The reversal of 28133538720 is 2783533182.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3116934 + ... + 3125946.

It is an arithmetic number, because the mean of its divisors is an integer number (528130260).

Almost surely, 228133538720 is an apocalyptic number.

28133538720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28133538720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50700504960).

28133538720 is an abundant number, since it is smaller than the sum of its proper divisors (73267471200).

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

28133538720 is a wasteful number, since it uses less digits than its factorization.

28133538720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9967 (or 9959 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 42.

The spelling of 28133538720 in words is "twenty-eight billion, one hundred thirty-three million, five hundred thirty-eight thousand, seven hundred twenty".