30981616 has 20 divisors (see below), whose sum is σ = 63558432. Its totient is φ = 14579456.

The previous prime is 30981611. The next prime is 30981637. The reversal of 30981616 is 61618903.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (30981611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56680 + ... + 57223.

Almost surely, 2^30981616 is an apocalyptic number.

It is an amenable number.

30981616 is an abundant number, since it is smaller than the sum of its proper divisors (32576816).

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

30981616 is a wasteful number, since it uses less digits than its factorization.

30981616 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113928 (or 113922 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 30981616 is about 5566.1131860572. The cubic root of 30981616 is about 314.0759549577.

The spelling of 30981616 in words is "thirty million, nine hundred eighty-one thousand, six hundred sixteen".