1256792788 has 12 divisors (see below), whose sum is σ = 2200305492. Its totient is φ = 628134080.

The previous prime is 1256792783. The next prime is 1256792809. The reversal of 1256792788 is 8872976521.

It can be written as a sum of positive squares in 2 ways, for example, as 365650884 + 891141904 = 19122^2 + 29852^2 .

It is a super-2 number, since 2×1256792788² = 3159056223937625888, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256792783) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54595 + ... + 74122.

It is an arithmetic number, because the mean of its divisors is an integer number (183358791).

Almost surely, 2^1256792788 is an apocalyptic number.

It is an amenable number.

1256792788 is a deficient number, since it is larger than the sum of its proper divisors (943512704).

1256792788 is a wasteful number, since it uses less digits than its factorization.

1256792788 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131162 (or 131160 counting only the distinct ones).

The product of its digits is 3386880, while the sum is 55.

The square root of 1256792788 is about 35451.2734326991. The cubic root of 1256792788 is about 1079.1651034902.

The spelling of 1256792788 in words is "one billion, two hundred fifty-six million, seven hundred ninety-two thousand, seven hundred eighty-eight".