56445643 has 4 divisors (see below), whose sum is σ = 57822408. Its totient is φ = 55068880.

The previous prime is 56445619. The next prime is 56445659. The reversal of 56445643 is 34654465.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56445643 is a prime.

It is a super-2 number, since 2×56445643² = 6372221227366898, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56445343) 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, 688321 + ... + 688402.

It is an arithmetic number, because the mean of its divisors is an integer number (14455602).

Almost surely, 2^56445643 is an apocalyptic number.

56445643 is a deficient number, since it is larger than the sum of its proper divisors (1376765).

56445643 is a wasteful number, since it uses less digits than its factorization.

56445643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1376764.

The product of its digits is 172800, while the sum is 37.

The square root of 56445643 is about 7513.0315452552. The cubic root of 56445643 is about 383.5984187024.

The spelling of 56445643 in words is "fifty-six million, four hundred forty-five thousand, six hundred forty-three".