56617818 has 8 divisors (see below), whose sum is σ = 113235648. Its totient is φ = 18872604.

The previous prime is 56617817. The next prime is 56617877. The reversal of 56617818 is 81871665.

It is a sphenic number, since it is the product of 3 distinct primes.

56617818 is an admirable number.

It is a super-2 number, since 2×56617818² = 6411154630162248, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 56617818.

It is not an unprimeable number, because it can be changed into a prime (56617817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4718146 + ... + 4718157.

It is an arithmetic number, because the mean of its divisors is an integer number (14154456).

Almost surely, 2^56617818 is an apocalyptic number.

56617818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

56617818 is a wasteful number, since it uses less digits than its factorization.

56617818 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9436308.

The product of its digits is 80640, while the sum is 42.

The square root of 56617818 is about 7524.4812445776. The cubic root of 56617818 is about 383.9880503009.

The spelling of 56617818 in words is "fifty-six million, six hundred seventeen thousand, eight hundred eighteen".