30091988 has 6 divisors (see below), whose sum is σ = 52660986. Its totient is φ = 15045992.

The previous prime is 30091967. The next prime is 30091993. The reversal of 30091988 is 88919003.

It can be written as a sum of positive squares in only one way, i.e., 23931664 + 6160324 = 4892^2 + 2482^2 .

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 3761495 + ... + 3761502.

It is an arithmetic number, because the mean of its divisors is an integer number (8776831).

Almost surely, 2^30091988 is an apocalyptic number.

It is an amenable number.

30091988 is a deficient number, since it is larger than the sum of its proper divisors (22568998).

30091988 is a wasteful number, since it uses less digits than its factorization.

30091988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7523001 (or 7522999 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 30091988 is about 5485.6164649016. The cubic root of 30091988 is about 311.0405133272.

The spelling of 30091988 in words is "thirty million, ninety-one thousand, nine hundred eighty-eight".