30491656 has 48 divisors (see below), whose sum is σ = 65221200. Its totient is φ = 13321152.

The previous prime is 30491651. The next prime is 30491701. The reversal of 30491656 is 65619403.

It is not an unprimeable number, because it can be changed into a prime (30491651) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25095 + ... + 26281.

It is an arithmetic number, because the mean of its divisors is an integer number (1358775).

Almost surely, 2^30491656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 30491656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32610600).

30491656 is an abundant number, since it is smaller than the sum of its proper divisors (34729544).

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

30491656 is a wasteful number, since it uses less digits than its factorization.

30491656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238 (or 1221 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 30491656 is about 5521.9250266551. The cubic root of 30491656 is about 312.4114940825.

The spelling of 30491656 in words is "thirty million, four hundred ninety-one thousand, six hundred fifty-six".