1604187256864 has 48 divisors (see below), whose sum is σ = 3336214603680. Its totient is φ = 757193011200.

The previous prime is 1604187256853. The next prime is 1604187256871. The reversal of 1604187256864 is 4686527814061.

It is a super-2 number, since 2×1604187256864² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1604187256799 and 1604187256808.

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, 4489537 + ... + 4833664.

It is an arithmetic number, because the mean of its divisors is an integer number (69504470910).

Almost surely, 2^{1604187256864} is an apocalyptic number.

It is an amenable number.

1604187256864 is an abundant number, since it is smaller than the sum of its proper divisors (1732027346816).

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

1604187256864 is a wasteful number, since it uses less digits than its factorization.

1604187256864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9323513 (or 9323505 counting only the distinct ones).

The product of its (nonzero) digits is 15482880, while the sum is 58.

The spelling of 1604187256864 in words is "one trillion, six hundred four billion, one hundred eighty-seven million, two hundred fifty-six thousand, eight hundred sixty-four".