56405671 has 4 divisors (see below), whose sum is σ = 64463632. Its totient is φ = 48347712.

The previous prime is 56405659. The next prime is 56405689. The reversal of 56405671 is 17650465.

It is a happy number.

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

It is not a de Polignac number, because 56405671 - 2⁷ = 56405543 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 (56405171) 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, 4028970 + ... + 4028983.

It is an arithmetic number, because the mean of its divisors is an integer number (16115908).

Almost surely, 2^56405671 is an apocalyptic number.

56405671 is a deficient number, since it is larger than the sum of its proper divisors (8057961).

56405671 is an equidigital number, since it uses as much as digits as its factorization.

56405671 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8057960.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 56405671 is about 7510.3708963007. The cubic root of 56405671 is about 383.5078488727.

It can be divided in two parts, 5640 and 5671, that added together give a palindrome (11311).

The spelling of 56405671 in words is "fifty-six million, four hundred five thousand, six hundred seventy-one".