1275799680 has 512 divisors, whose sum is σ = 4943980800. Its totient is φ = 309657600.

The previous prime is 1275799667. The next prime is 1275799691. The reversal of 1275799680 is 869975721.

1275799680 is a `hidden beast` number, since 1 + 2 + 7 + 579 + 9 + 68 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 12631630 + ... + 12631730.

Almost surely, 2^1275799680 is an apocalyptic number.

1275799680 is a gapful number since it is divisible by the number (10) 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 1275799680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2471990400).

1275799680 is an abundant number, since it is smaller than the sum of its proper divisors (3668181120).

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

1275799680 is a wasteful number, since it uses less digits than its factorization.

1275799680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 171 counting only the distinct ones).

The product of its (nonzero) digits is 1905120, while the sum is 54.

The square root of 1275799680 is about 35718.3381472319. The cubic root of 1275799680 is about 1084.5780969874.

The spelling of 1275799680 in words is "one billion, two hundred seventy-five million, seven hundred ninety-nine thousand, six hundred eighty".