30661388 has 6 divisors (see below), whose sum is σ = 53657436. Its totient is φ = 15330692.

The previous prime is 30661363. The next prime is 30661403. The reversal of 30661388 is 88316603.

It is a happy number.

It is a super-3 number, since 3×30661388³ (a number of 23 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3832670 + ... + 3832677.

It is an arithmetic number, because the mean of its divisors is an integer number (8942906).

Almost surely, 2^30661388 is an apocalyptic number.

It is an amenable number.

30661388 is a deficient number, since it is larger than the sum of its proper divisors (22996048).

30661388 is a wasteful number, since it uses less digits than its factorization.

30661388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7665351 (or 7665349 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 30661388 is about 5537.2726138416. The cubic root of 30661388 is about 312.9901019983.

The spelling of 30661388 in words is "thirty million, six hundred sixty-one thousand, three hundred eighty-eight".