30685988 has 24 divisors (see below), whose sum is σ = 57311520. Its totient is φ = 14333760.

The previous prime is 30685981. The next prime is 30685997. The reversal of 30685988 is 88958603.

It is a super-2 number, since 2×30685988² = 1883259719072288, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (30685981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2783 + ... + 8313.

It is an arithmetic number, because the mean of its divisors is an integer number (2387980).

Almost surely, 2^30685988 is an apocalyptic number.

30685988 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

30685988 is a deficient number, since it is larger than the sum of its proper divisors (26625532).

30685988 is a wasteful number, since it uses less digits than its factorization.

30685988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5627 (or 5625 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 47.

The square root of 30685988 is about 5539.4934786495. The cubic root of 30685988 is about 313.0737848622.

The spelling of 30685988 in words is "thirty million, six hundred eighty-five thousand, nine hundred eighty-eight".