30640402 has 16 divisors (see below), whose sum is σ = 49938840. Its totient is φ = 14015232.

The previous prime is 30640399. The next prime is 30640417. The reversal of 30640402 is 20404603.

It can be written as a sum of positive squares in 4 ways, for example, as 21706281 + 8934121 = 4659^2 + 2989^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 30640402.

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 7 ways as a sum of consecutive naturals, for example, 2277 + ... + 8152.

Almost surely, 2^30640402 is an apocalyptic number.

30640402 is a deficient number, since it is larger than the sum of its proper divisors (19298438).

30640402 is a wasteful number, since it uses less digits than its factorization.

30640402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10557.

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

The square root of 30640402 is about 5535.3773132461. The cubic root of 30640402 is about 312.9186776451.

The spelling of 30640402 in words is "thirty million, six hundred forty thousand, four hundred two".