38691957408 has 48 divisors (see below), whose sum is σ = 109379190816. Its totient is φ = 11905217280.

The previous prime is 38691957377. The next prime is 38691957433. The reversal of 38691957408 is 80475919683.

It is a tau number, because it is divible by the number of its divisors (48).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15500338 + ... + 15502833.

It is an arithmetic number, because the mean of its divisors is an integer number (2278733142).

Almost surely, 2^38691957408 is an apocalyptic number.

It is an amenable number.

38691957408 is an abundant number, since it is smaller than the sum of its proper divisors (70687233408).

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

38691957408 is a wasteful number, since it uses less digits than its factorization.

38691957408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31003197 (or 31003189 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 60.

The spelling of 38691957408 in words is "thirty-eight billion, six hundred ninety-one million, nine hundred fifty-seven thousand, four hundred eight".