52639987 has 2 divisors, whose sum is σ = 52639988. Its totient is φ = 52639986.

The previous prime is 52639967. The next prime is 52639997. The reversal of 52639987 is 78993625.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-52639987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 52639987.

It is not a weakly prime, because it can be changed into another prime (52639907) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26319993 + 26319994.

It is an arithmetic number, because the mean of its divisors is an integer number (26319994).

Almost surely, 2^52639987 is an apocalyptic number.

52639987 is a deficient number, since it is larger than the sum of its proper divisors (1).

52639987 is an equidigital number, since it uses as much as digits as its factorization.

52639987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 52639987 is about 7255.3419629953. The cubic root of 52639987 is about 374.7761318629.

The spelling of 52639987 in words is "fifty-two million, six hundred thirty-nine thousand, nine hundred eighty-seven".