30640856 has 16 divisors (see below), whose sum is σ = 57526200. Its totient is φ = 15300544.

The previous prime is 30640843. The next prime is 30640859. The reversal of 30640856 is 65804603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30640859) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5615 + ... + 9633.

Almost surely, 2^30640856 is an apocalyptic number.

It is an amenable number.

30640856 is a deficient number, since it is larger than the sum of its proper divisors (26885344).

30640856 is a wasteful number, since it uses less digits than its factorization.

30640856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4978 (or 4974 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 30640856 is about 5535.4183220422. The cubic root of 30640856 is about 312.9202231467.

The spelling of 30640856 in words is "thirty million, six hundred forty thousand, eight hundred fifty-six".