38400866128 has 20 divisors (see below), whose sum is σ = 74875579060. Its totient is φ = 19078136064.

The previous prime is 38400866111. The next prime is 38400866149. The reversal of 38400866128 is 82166800483.

It can be written as a sum of positive squares in 2 ways, for example, as 18329910544 + 20070955584 = 135388^2 + 141672^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7640973 + ... + 7645996.

It is an arithmetic number, because the mean of its divisors is an integer number (3743778953).

Almost surely, 2^38400866128 is an apocalyptic number.

It is an amenable number.

38400866128 is a deficient number, since it is larger than the sum of its proper divisors (36474712932).

38400866128 is a wasteful number, since it uses less digits than its factorization.

38400866128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15287134 (or 15287128 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 38400866128 in words is "thirty-eight billion, four hundred million, eight hundred sixty-six thousand, one hundred twenty-eight".