30691388 has 24 divisors (see below), whose sum is σ = 66105312. Its totient is φ = 12141504.

The previous prime is 30691369. The next prime is 30691391. The reversal of 30691388 is 88319603.

It is a super-2 number, since 2×30691388² = 1883922594733088, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

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, 41795 + ... + 42522.

It is an arithmetic number, because the mean of its divisors is an integer number (2754388).

Almost surely, 2^30691388 is an apocalyptic number.

It is an amenable number.

30691388 is an abundant number, since it is smaller than the sum of its proper divisors (35413924).

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

30691388 is a wasteful number, since it uses less digits than its factorization.

30691388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84341 (or 84339 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 30691388 is about 5539.9808663930. The cubic root of 30691388 is about 313.0921482846.

The spelling of 30691388 in words is "thirty million, six hundred ninety-one thousand, three hundred eighty-eight".