56671687 has 2 divisors, whose sum is σ = 56671688. Its totient is φ = 56671686.

The previous prime is 56671673. The next prime is 56671691. The reversal of 56671687 is 78617665.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56671687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56671697) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28335843 + 28335844.

It is an arithmetic number, because the mean of its divisors is an integer number (28335844).

Almost surely, 2^56671687 is an apocalyptic number.

56671687 is a deficient number, since it is larger than the sum of its proper divisors (1).

56671687 is an equidigital number, since it uses as much as digits as its factorization.

56671687 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 423360, while the sum is 46.

The square root of 56671687 is about 7528.0599758504. The cubic root of 56671687 is about 384.1097934565.

The spelling of 56671687 in words is "fifty-six million, six hundred seventy-one thousand, six hundred eighty-seven".