30787172 has 12 divisors (see below), whose sum is σ = 58022076. Its totient is φ = 14209440.

The previous prime is 30787151. The next prime is 30787177. The reversal of 30787172 is 27178703.

It can be written as a sum of positive squares in 2 ways, for example, as 3182656 + 27604516 = 1784^2 + 5254^2 .

It is not an unprimeable number, because it can be changed into a prime (30787177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 295979 + ... + 296082.

It is an arithmetic number, because the mean of its divisors is an integer number (4835173).

Almost surely, 2^30787172 is an apocalyptic number.

It is an amenable number.

30787172 is a deficient number, since it is larger than the sum of its proper divisors (27234904).

30787172 is a wasteful number, since it uses less digits than its factorization.

30787172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 592078 (or 592076 counting only the distinct ones).

The product of its (nonzero) digits is 16464, while the sum is 35.

The square root of 30787172 is about 5548.6189272647. The cubic root of 30787172 is about 313.4175172423.

The spelling of 30787172 in words is "thirty million, seven hundred eighty-seven thousand, one hundred seventy-two".