30861656 has 32 divisors (see below), whose sum is σ = 66731040. Its totient is φ = 13106688.

The previous prime is 30861631. The next prime is 30861671. The reversal of 30861656 is 65616803.

It is a super-2 number, since 2×30861656² = 1904883622124672, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3890 + ... + 8766.

It is an arithmetic number, because the mean of its divisors is an integer number (2085345).

Almost surely, 2^30861656 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 30861656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33365520).

30861656 is an abundant number, since it is smaller than the sum of its proper divisors (35869384).

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

30861656 is a wasteful number, since it uses less digits than its factorization.

30861656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5003 (or 4999 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 30861656 is about 5555.3268130687. The cubic root of 30861656 is about 313.6700660377.

The spelling of 30861656 in words is "thirty million, eight hundred sixty-one thousand, six hundred fifty-six".