56081645 has 8 divisors (see below), whose sum is σ = 68939640. Its totient is φ = 43770880.

The previous prime is 56081633. The next prime is 56081647. The reversal of 56081645 is 54618065.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3924361 + 52157284 = 1981^2 + 7222^2 .

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

It is not a de Polignac number, because 56081645 - 2⁴ = 56081629 is a prime.

It is a super-3 number, since 3×56081645³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56081647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 136580 + ... + 136989.

It is an arithmetic number, because the mean of its divisors is an integer number (8617455).

Almost surely, 2^56081645 is an apocalyptic number.

It is an amenable number.

56081645 is a deficient number, since it is larger than the sum of its proper divisors (12857995).

56081645 is a wasteful number, since it uses less digits than its factorization.

56081645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273615.

The product of its (nonzero) digits is 28800, while the sum is 35.

The square root of 56081645 is about 7488.7679226960. The cubic root of 56081645 is about 382.7720763480.

The spelling of 56081645 in words is "fifty-six million, eighty-one thousand, six hundred forty-five".