813864572 has 12 divisors (see below), whose sum is σ = 1426761336. Its totient is φ = 406218480.

The previous prime is 813864559. The next prime is 813864587. The reversal of 813864572 is 275468318.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 175883 + ... + 180450.

It is an arithmetic number, because the mean of its divisors is an integer number (118896778).

Almost surely, 2^813864572 is an apocalyptic number.

It is an amenable number.

813864572 is a deficient number, since it is larger than the sum of its proper divisors (612896764).

813864572 is a wasteful number, since it uses less digits than its factorization.

813864572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356908 (or 356906 counting only the distinct ones).

The product of its digits is 322560, while the sum is 44.

The square root of 813864572 is about 28528.3117621776. The cubic root of 813864572 is about 933.6498847458.

It can be divided in two parts, 81386 and 4572, that added together give a palindrome (85958).

The spelling of 813864572 in words is "eight hundred thirteen million, eight hundred sixty-four thousand, five hundred seventy-two".