56667887 has 2 divisors, whose sum is σ = 56667888. Its totient is φ = 56667886.

The previous prime is 56667881. The next prime is 56667889. The reversal of 56667887 is 78876665.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56667887 - 2¹⁸ = 56405743 is a prime.

It is a super-2 number, since 2×56667887² = 6422498834089538, which contains 22 as substring.

Together with 56667889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56667881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333943 + 28333944.

It is an arithmetic number, because the mean of its divisors is an integer number (28333944).

Almost surely, 2^56667887 is an apocalyptic number.

56667887 is a deficient number, since it is larger than the sum of its proper divisors (1).

56667887 is an equidigital number, since it uses as much as digits as its factorization.

56667887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 53.

The square root of 56667887 is about 7527.8075825568. The cubic root of 56667887 is about 384.1012080416.

The spelling of 56667887 in words is "fifty-six million, six hundred sixty-seven thousand, eight hundred eighty-seven".