56281440 has 96 divisors (see below), whose sum is σ = 182135520. Its totient is φ = 14598144.

The previous prime is 56281429. The next prime is 56281471. The reversal of 56281440 is 4418265.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 56281398 and 56281407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16176 + ... + 19344.

It is an arithmetic number, because the mean of its divisors is an integer number (1897245).

Almost surely, 2^56281440 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 56281440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91067760).

56281440 is an abundant number, since it is smaller than the sum of its proper divisors (125854080).

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

56281440 is a wasteful number, since it uses less digits than its factorization.

56281440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3224 (or 3216 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 56281440 is about 7502.0957072008. The cubic root of 56281440 is about 383.2260888818.

The spelling of 56281440 in words is "fifty-six million, two hundred eighty-one thousand, four hundred forty".