64537987 has 2 divisors, whose sum is σ = 64537988. Its totient is φ = 64537986.

The previous prime is 64537981. The next prime is 64538011. The reversal of 64537987 is 78973546.

It is a happy number.

64537987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64537987 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 64537987.

It is not a weakly prime, because it can be changed into another prime (64537981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32268993 + 32268994.

It is an arithmetic number, because the mean of its divisors is an integer number (32268994).

Almost surely, 2^64537987 is an apocalyptic number.

64537987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64537987 is an equidigital number, since it uses as much as digits as its factorization.

64537987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1270080, while the sum is 49.

The square root of 64537987 is about 8033.5538213172. The cubic root of 64537987 is about 401.1176803180.

The spelling of 64537987 in words is "sixty-four million, five hundred thirty-seven thousand, nine hundred eighty-seven".