30640660 has 12 divisors (see below), whose sum is σ = 64345428. Its totient is φ = 12256256.

The previous prime is 30640657. The next prime is 30640667. The reversal of 30640660 is 6604603.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 10010896 + 20629764 = 3164^2 + 4542^2 .

It is a congruent number.

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

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, 765997 + ... + 766036.

It is an arithmetic number, because the mean of its divisors is an integer number (5362119).

Almost surely, 2^30640660 is an apocalyptic number.

It is an amenable number.

30640660 is an abundant number, since it is smaller than the sum of its proper divisors (33704768).

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

30640660 is a wasteful number, since it uses less digits than its factorization.

30640660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1532042 (or 1532040 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 30640660 is about 5535.4006178415. The cubic root of 30640660 is about 312.9195559276.

The spelling of 30640660 in words is "thirty million, six hundred forty thousand, six hundred sixty".