30640056 has 32 divisors (see below), whose sum is σ = 77859600. Its totient is φ = 10045440.

The previous prime is 30640019. The next prime is 30640087. The reversal of 30640056 is 65004603.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

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, 9001 + ... + 11928.

Almost surely, 2^30640056 is an apocalyptic number.

It is an amenable number.

30640056 is an abundant number, since it is smaller than the sum of its proper divisors (47219544).

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

30640056 is a wasteful number, since it uses less digits than its factorization.

30640056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20999 (or 20995 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 30640056 is about 5535.3460596425. The cubic root of 30640056 is about 312.9174997855.

Adding to 30640056 its reverse (65004603), we get a palindrome (95644659).

The spelling of 30640056 in words is "thirty million, six hundred forty thousand, fifty-six".