56891646 has 72 divisors (see below), whose sum is σ = 148763160. Its totient is φ = 16247952.

The previous prime is 56891633. The next prime is 56891651. The reversal of 56891646 is 64619865.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 22620 + ... + 25008.

It is an arithmetic number, because the mean of its divisors is an integer number (2066155).

Almost surely, 2^56891646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56891646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74381580).

56891646 is an abundant number, since it is smaller than the sum of its proper divisors (91871514).

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

56891646 is a wasteful number, since it uses less digits than its factorization.

56891646 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2420 (or 2401 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 56891646 is about 7542.6551028136. The cubic root of 56891646 is about 384.6060985061.

The spelling of 56891646 in words is "fifty-six million, eight hundred ninety-one thousand, six hundred forty-six".