56687669 has 2 divisors, whose sum is σ = 56687670. Its totient is φ = 56687668.

The previous prime is 56687647. The next prime is 56687671. The reversal of 56687669 is 96678665.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53831569 + 2856100 = 7337^2 + 1690^2 .

It is a cyclic number.

It is not a de Polignac number, because 56687669 - 2¹⁶ = 56622133 is a prime.

It is a super-2 number, since 2×56687669² = 6426983633307122, which contains 22 as substring.

Together with 56687671, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56687669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (56687629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28343834 + 28343835.

It is an arithmetic number, because the mean of its divisors is an integer number (28343835).

Almost surely, 2^56687669 is an apocalyptic number.

It is an amenable number.

56687669 is a deficient number, since it is larger than the sum of its proper divisors (1).

56687669 is an equidigital number, since it uses as much as digits as its factorization.

56687669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3265920, while the sum is 53.

The square root of 56687669 is about 7529.1213962852. The cubic root of 56687669 is about 384.1458977034.

The spelling of 56687669 in words is "fifty-six million, six hundred eighty-seven thousand, six hundred sixty-nine".