56440000 has 140 divisors (see below), whose sum is σ = 149970744. Its totient is φ = 20992000.

The previous prime is 56439989. The next prime is 56440009. The reversal of 56440000 is 4465.

56440000 is a nontrivial binomial coefficient, being equal to C(10625, 2).

It is a self number, because there is not a number n which added to its sum of digits gives 56440000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56440009) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 679959 + ... + 680041.

Almost surely, 2^56440000 is an apocalyptic number.

56440000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

56440000 is the 10624-th triangular number.

56440000 is the 3542-nd centered nonagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56440000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74985372).

56440000 is an abundant number, since it is smaller than the sum of its proper divisors (93530744).

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

56440000 is an equidigital number, since it uses as much as digits as its factorization.

56440000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132 (or 107 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 56440000 is about 7512.6559883972. The cubic root of 56440000 is about 383.5856352061.

Adding to 56440000 its reverse (4465), we get a palindrome (56444465).

The spelling of 56440000 in words is "fifty-six million, four hundred forty thousand".