30445640 has 32 divisors (see below), whose sum is σ = 72533880. Its totient is φ = 11461632.

The previous prime is 30445637. The next prime is 30445651. The reversal of 30445640 is 4654403.

It can be written as a sum of positive squares in 4 ways, for example, as 28922884 + 1522756 = 5378^2 + 1234^2 .

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, 21707 + ... + 23066.

Almost surely, 2^30445640 is an apocalyptic number.

It is an amenable number.

30445640 is an abundant number, since it is smaller than the sum of its proper divisors (42088240).

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

30445640 is a wasteful number, since it uses less digits than its factorization.

30445640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44801 (or 44797 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 30445640 is about 5517.7567905808. The cubic root of 30445640 is about 312.2542580054.

The spelling of 30445640 in words is "thirty million, four hundred forty-five thousand, six hundred forty".