56669887 has 2 divisors, whose sum is σ = 56669888. Its totient is φ = 56669886.

The previous prime is 56669867. The next prime is 56669897. The reversal of 56669887 is 78896665.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56669887 - 2⁷ = 56669759 is a prime.

It is a super-2 number, since 2×56669887² = 6422952185185538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56669867) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28334943 + 28334944.

It is an arithmetic number, because the mean of its divisors is an integer number (28334944).

Almost surely, 2^56669887 is an apocalyptic number.

56669887 is a deficient number, since it is larger than the sum of its proper divisors (1).

56669887 is an equidigital number, since it uses as much as digits as its factorization.

56669887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 4354560, while the sum is 55.

The square root of 56669887 is about 7527.9404221872. The cubic root of 56669887 is about 384.1057267289.

The spelling of 56669887 in words is "fifty-six million, six hundred sixty-nine thousand, eight hundred eighty-seven".