30640208 has 20 divisors (see below), whose sum is σ = 60035220. Its totient is φ = 15147264.

The previous prime is 30640177. The next prime is 30640219. The reversal of 30640208 is 80204603.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 8248384 + 22391824 = 2872^2 + 4732^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9335 + ... + 12182.

It is an arithmetic number, because the mean of its divisors is an integer number (3001761).

Almost surely, 2^30640208 is an apocalyptic number.

It is an amenable number.

30640208 is a deficient number, since it is larger than the sum of its proper divisors (29395012).

30640208 is a wasteful number, since it uses less digits than its factorization.

30640208 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21614 (or 21608 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 30640208 is about 5535.3597895710. The cubic root of 30640208 is about 312.9180172278.

The spelling of 30640208 in words is "thirty million, six hundred forty thousand, two hundred eight".