39664863690 has 32 divisors (see below), whose sum is σ = 97221116160. Its totient is φ = 10352247744.

The previous prime is 39664863673. The next prime is 39664863703. The reversal of 39664863690 is 9636846693.

It is a happy number.

39664863690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×39664863690² (a number of 22 digits) contains 22 as substring.

It is a Curzon 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, 14064145 + ... + 14066964.

It is an arithmetic number, because the mean of its divisors is an integer number (3038159880).

Almost surely, 2^39664863690 is an apocalyptic number.

39664863690 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

39664863690 is an abundant number, since it is smaller than the sum of its proper divisors (57556252470).

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

39664863690 is a wasteful number, since it uses less digits than its factorization.

39664863690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28131166.

The product of its (nonzero) digits is 30233088, while the sum is 60.

The spelling of 39664863690 in words is "thirty-nine billion, six hundred sixty-four million, eight hundred sixty-three thousand, six hundred ninety".