381251913828 has 12 divisors (see below), whose sum is σ = 889587798960. Its totient is φ = 127083971272.

The previous prime is 381251913787. The next prime is 381251913859. The reversal of 381251913828 is 828319152183.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×381251913828² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15885496398 + ... + 15885496421.

It is an arithmetic number, because the mean of its divisors is an integer number (74132316580).

Almost surely, 2^381251913828 is an apocalyptic number.

It is an amenable number.

381251913828 is an abundant number, since it is smaller than the sum of its proper divisors (508335885132).

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

381251913828 is a wasteful number, since it uses less digits than its factorization.

381251913828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31770992826 (or 31770992824 counting only the distinct ones).

The product of its digits is 829440, while the sum is 51.

The spelling of 381251913828 in words is "three hundred eighty-one billion, two hundred fifty-one million, nine hundred thirteen thousand, eight hundred twenty-eight".