56181840 has 160 divisors (see below), whose sum is σ = 204736896. Its totient is φ = 12564480.

The previous prime is 56181817. The next prime is 56181859. The reversal of 56181840 is 4818165.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 33502 + ... + 35138.

Almost surely, 2^56181840 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 56181840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102368448).

56181840 is an abundant number, since it is smaller than the sum of its proper divisors (148555056).

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

56181840 is a wasteful number, since it uses less digits than its factorization.

56181840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1677 (or 1671 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 33.

The square root of 56181840 is about 7495.4546226363. The cubic root of 56181840 is about 382.9998931981. Note that the first 3 decimals are identical.

The spelling of 56181840 in words is "fifty-six million, one hundred eighty-one thousand, eight hundred forty".