30640665 has 32 divisors (see below), whose sum is σ = 53778816. Its totient is φ = 14773760.

The previous prime is 30640657. The next prime is 30640667. The reversal of 30640665 is 56604603.

It is not a de Polignac number, because 30640665 - 2³ = 30640657 is a prime.

It is not an unprimeable number, because it can be changed into a prime (30640667) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38047 + ... + 38843.

It is an arithmetic number, because the mean of its divisors is an integer number (1680588).

Almost surely, 2^30640665 is an apocalyptic number.

It is an amenable number.

30640665 is a deficient number, since it is larger than the sum of its proper divisors (23138151).

30640665 is a wasteful number, since it uses less digits than its factorization.

30640665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1049.

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

The square root of 30640665 is about 5535.4010694800. The cubic root of 30640665 is about 312.9195729485.

The spelling of 30640665 in words is "thirty million, six hundred forty thousand, six hundred sixty-five".