1531800864 has 72 divisors (see below), whose sum is σ = 4752073872. Its totient is φ = 464181120.

The previous prime is 1531800841. The next prime is 1531800887. The reversal of 1531800864 is 4680081351.

It is an interprime number because it is at equal distance from previous prime (1531800841) and next prime (1531800887).

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×1531800864² = 4692827773902292992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 238594 + ... + 244929.

It is an arithmetic number, because the mean of its divisors is an integer number (66001026).

Almost surely, 2^1531800864 is an apocalyptic number.

It is an amenable number.

1531800864 is an abundant number, since it is smaller than the sum of its proper divisors (3220273008).

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

1531800864 is a wasteful number, since it uses less digits than its factorization.

1531800864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483550 (or 483539 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 1531800864 is about 39138.2276553244. The cubic root of 1531800864 is about 1152.7472726818.

The spelling of 1531800864 in words is "one billion, five hundred thirty-one million, eight hundred thousand, eight hundred sixty-four".