7256755638 has 24 divisors (see below), whose sum is σ = 17152331976. Its totient is φ = 2199016800.

The previous prime is 7256755619. The next prime is 7256755651. The reversal of 7256755638 is 8365576527.

7256755638 is a `hidden beast` number, since 7 + 2 + 5 + 6 + 75 + 563 + 8 = 666.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18324943 + ... + 18325338.

It is an arithmetic number, because the mean of its divisors is an integer number (714680499).

Almost surely, 2^7256755638 is an apocalyptic number.

7256755638 is an abundant number, since it is smaller than the sum of its proper divisors (9895576338).

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

7256755638 is a wasteful number, since it uses less digits than its factorization.

7256755638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36650300 (or 36650297 counting only the distinct ones).

The product of its digits is 10584000, while the sum is 54.

The square root of 7256755638 is about 85186.5930648714. The cubic root of 7256755638 is about 1936.0392886624.

The spelling of 7256755638 in words is "seven billion, two hundred fifty-six million, seven hundred fifty-five thousand, six hundred thirty-eight".