56691407 has 8 divisors (see below), whose sum is σ = 57513456. Its totient is φ = 55872832.

The previous prime is 56691377. The next prime is 56691419. The reversal of 56691407 is 70419665.

56691407 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56691407 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 (56691457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 65723 + ... + 66579.

It is an arithmetic number, because the mean of its divisors is an integer number (7189182).

Almost surely, 2^56691407 is an apocalyptic number.

56691407 is a deficient number, since it is larger than the sum of its proper divisors (822049).

56691407 is an equidigital number, since it uses as much as digits as its factorization.

56691407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1737.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 56691407 is about 7529.3696283288. The cubic root of 56691407 is about 384.1543410788.

The spelling of 56691407 in words is "fifty-six million, six hundred ninety-one thousand, four hundred seven".