56643767 has 4 divisors (see below), whose sum is σ = 57173256. Its totient is φ = 56114280.

The previous prime is 56643749. The next prime is 56643773. The reversal of 56643767 is 76734665.

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-56643767 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56643667) 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, 264584 + ... + 264797.

It is an arithmetic number, because the mean of its divisors is an integer number (14293314).

Almost surely, 2^56643767 is an apocalyptic number.

56643767 is a deficient number, since it is larger than the sum of its proper divisors (529489).

56643767 is a wasteful number, since it uses less digits than its factorization.

56643767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 529488.

The product of its digits is 635040, while the sum is 44.

The square root of 56643767 is about 7526.2053519685. The cubic root of 56643767 is about 384.0467042983.

It can be divided in two parts, 56643 and 767, that multiplied together give a triangular number (43445181 = T₉₃₂₁).

The spelling of 56643767 in words is "fifty-six million, six hundred forty-three thousand, seven hundred sixty-seven".