30888945 has 24 divisors (see below), whose sum is σ = 55526016. Its totient is φ = 16473456.

The previous prime is 30888941. The next prime is 30888953. The reversal of 30888945 is 54988803.

It is not a de Polignac number, because 30888945 - 2² = 30888941 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 30888945.

It is not an unprimeable number, because it can be changed into a prime (30888941) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11497 + ... + 13926.

It is an arithmetic number, because the mean of its divisors is an integer number (2313584).

Almost surely, 2^30888945 is an apocalyptic number.

It is an amenable number.

30888945 is a deficient number, since it is larger than the sum of its proper divisors (24637071).

30888945 is an equidigital number, since it uses as much as digits as its factorization.

30888945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25443 (or 25431 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The square root of 30888945 is about 5557.7823814899. The cubic root of 30888945 is about 313.7624916324.

It can be divided in two parts, 308 and 88945, that added together give a triangular number (89253 = T₄₂₂).

The spelling of 30888945 in words is "thirty million, eight hundred eighty-eight thousand, nine hundred forty-five".