30640420 has 12 divisors (see below), whose sum is σ = 64344924. Its totient is φ = 12256160.

The previous prime is 30640417. The next prime is 30640453. The reversal of 30640420 is 2404603.

It can be written as a sum of positive squares in 2 ways, for example, as 3849444 + 26790976 = 1962^2 + 5176^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 765991 + ... + 766030.

It is an arithmetic number, because the mean of its divisors is an integer number (5362077).

Almost surely, 2^30640420 is an apocalyptic number.

It is an amenable number.

30640420 is an abundant number, since it is smaller than the sum of its proper divisors (33704504).

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

30640420 is a wasteful number, since it uses less digits than its factorization.

30640420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532030 (or 1532028 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 30640420 is about 5535.3789391513. The cubic root of 30640420 is about 312.9187389207.

The spelling of 30640420 in words is "thirty million, six hundred forty thousand, four hundred twenty".