56451520 has 56 divisors (see below), whose sum is σ = 136483344. Its totient is φ = 22235136.

The previous prime is 56451517. The next prime is 56451539. The reversal of 56451520 is 2515465.

It is a super-2 number, since 2×56451520² = 6373548220620800, 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, 20124 + ... + 22756.

Almost surely, 2^56451520 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 56451520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68241672).

56451520 is an abundant number, since it is smaller than the sum of its proper divisors (80031824).

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

56451520 is a wasteful number, since it uses less digits than its factorization.

56451520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2717 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 28.

The square root of 56451520 is about 7513.4226554880. The cubic root of 56451520 is about 383.6117313902.

Adding to 56451520 its reverse (2515465), we get a palindrome (58966985).

The spelling of 56451520 in words is "fifty-six million, four hundred fifty-one thousand, five hundred twenty".