30640566 has 16 divisors (see below), whose sum is σ = 66852288. Its totient is φ = 9285000.

The previous prime is 30640537. The next prime is 30640567. The reversal of 30640566 is 66504603.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640567) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 232060 + ... + 232191.

It is an arithmetic number, because the mean of its divisors is an integer number (4178268).

Almost surely, 2^30640566 is an apocalyptic number.

30640566 is an abundant number, since it is smaller than the sum of its proper divisors (36211722).

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

30640566 is a wasteful number, since it uses less digits than its factorization.

30640566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 464267.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 30640566 is about 5535.3921270313. The cubic root of 30640566 is about 312.9192359338.

The spelling of 30640566 in words is "thirty million, six hundred forty thousand, five hundred sixty-six".