30864561 has 48 divisors (see below), whose sum is σ = 53319168. Its totient is φ = 15724800.

The previous prime is 30864557. The next prime is 30864563. The reversal of 30864561 is 16546803.

It is not a de Polignac number, because 30864561 - 2² = 30864557 is a prime.

It is a super-2 number, since 2×30864561² = 1905242251445442, which contains 22 as substring.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (30864563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 58981 + ... + 59501.

It is an arithmetic number, because the mean of its divisors is an integer number (1110816).

Almost surely, 2^30864561 is an apocalyptic number.

30864561 is a gapful number since it is divisible by the number (31) formed by its first and last digit.

It is an amenable number.

30864561 is a deficient number, since it is larger than the sum of its proper divisors (22454607).

30864561 is a wasteful number, since it uses less digits than its factorization.

30864561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 582 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 30864561 is about 5555.5882676815. The cubic root of 30864561 is about 313.6799076240.

The spelling of 30864561 in words is "thirty million, eight hundred sixty-four thousand, five hundred sixty-one".