56997720 has 192 divisors, whose sum is σ = 210319200. Its totient is φ = 13271040.

The previous prime is 56997713. The next prime is 56997761. The reversal of 56997720 is 2779965.

It is a super-3 number, since 3×56997720³ (a number of 24 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 88600 + ... + 89240.

Almost surely, 2^56997720 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 56997720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105159600).

56997720 is an abundant number, since it is smaller than the sum of its proper divisors (153321480).

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

56997720 is a wasteful number, since it uses less digits than its factorization.

56997720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690 (or 683 counting only the distinct ones).

The product of its (nonzero) digits is 238140, while the sum is 45.

The square root of 56997720 is about 7549.6834370720. The cubic root of 56997720 is about 384.8449817244.

It can be divided in two parts, 569 and 97720, that added together give a palindrome (98289).

The spelling of 56997720 in words is "fifty-six million, nine hundred ninety-seven thousand, seven hundred twenty".