1387664004 has 12 divisors (see below), whose sum is σ = 3237882704. Its totient is φ = 462554664.

The previous prime is 1387663997. The next prime is 1387664009. The reversal of 1387664004 is 4004667831.

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

It is a super-2 number, since 2×1387664004² = 3851222775994624032, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1387664009) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 57819322 + ... + 57819345.

Almost surely, 2^1387664004 is an apocalyptic number.

It is an amenable number.

1387664004 is an abundant number, since it is smaller than the sum of its proper divisors (1850218700).

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

1387664004 is a wasteful number, since it uses less digits than its factorization.

1387664004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115638674 (or 115638672 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 39.

The square root of 1387664004 is about 37251.3624448825. The cubic root of 1387664004 is about 1115.3934956808.

The spelling of 1387664004 in words is "one billion, three hundred eighty-seven million, six hundred sixty-four thousand, four".