39640768625 has 16 divisors (see below), whose sum is σ = 50808757584. Its totient is φ = 30855513600.

The previous prime is 39640768619. The next prime is 39640768637. The reversal of 39640768625 is 52686704693.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 8630967409 + 31009801216 = 92903^2 + 176096^2 .

It is not a de Polignac number, because 39640768625 - 2⁶ = 39640768561 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4280864 + ... + 4290113.

It is an arithmetic number, because the mean of its divisors is an integer number (3175547349).

Almost surely, 2^39640768625 is an apocalyptic number.

It is an amenable number.

39640768625 is a deficient number, since it is larger than the sum of its proper divisors (11167988959).

39640768625 is an equidigital number, since it uses as much as digits as its factorization.

39640768625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8571029 (or 8571019 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 56.

The spelling of 39640768625 in words is "thirty-nine billion, six hundred forty million, seven hundred sixty-eight thousand, six hundred twenty-five".