56681724 has 72 divisors (see below), whose sum is σ = 147172480. Its totient is φ = 16964640.

The previous prime is 56681719. The next prime is 56681741. The reversal of 56681724 is 42718665.

It is a super-2 number, since 2×56681724² = 6425635671224352, 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 23 ways as a sum of consecutive naturals, for example, 149367 + ... + 149745.

Almost surely, 2^56681724 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 56681724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73586240).

56681724 is an abundant number, since it is smaller than the sum of its proper divisors (90490756).

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

56681724 is a wasteful number, since it uses less digits than its factorization.

56681724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511 (or 498 counting only the distinct ones).

The product of its digits is 80640, while the sum is 39.

The square root of 56681724 is about 7528.7265855522. The cubic root of 56681724 is about 384.1324684030.

The spelling of 56681724 in words is "fifty-six million, six hundred eighty-one thousand, seven hundred twenty-four".