7640978925 has 24 divisors (see below), whose sum is σ = 13182352704. Its totient is φ = 3898005760.

The previous prime is 7640978911. The next prime is 7640978959. The reversal of 7640978925 is 5298790467.

It is not a de Polignac number, because 7640978925 - 2⁴ = 7640978909 is a prime.

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 23 ways as a sum of consecutive naturals, for example, 2213052 + ... + 2216501.

It is an arithmetic number, because the mean of its divisors is an integer number (549264696).

Almost surely, 2^7640978925 is an apocalyptic number.

7640978925 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

7640978925 is a deficient number, since it is larger than the sum of its proper divisors (5541373779).

7640978925 is a wasteful number, since it uses less digits than its factorization.

7640978925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4429589 (or 4429584 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 57.

The square root of 7640978925 is about 87412.6931572297. The cubic root of 7640978925 is about 1969.6225173645.

The spelling of 7640978925 in words is "seven billion, six hundred forty million, nine hundred seventy-eight thousand, nine hundred twenty-five".