64507987 has 2 divisors, whose sum is σ = 64507988. Its totient is φ = 64507986.

The previous prime is 64507981. The next prime is 64507991. The reversal of 64507987 is 78970546.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64507987 is a prime.

It is a super-2 number, since 2×64507987² = 8322560773584338, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (64507981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32253993 + 32253994.

It is an arithmetic number, because the mean of its divisors is an integer number (32253994).

Almost surely, 2^64507987 is an apocalyptic number.

64507987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64507987 is an equidigital number, since it uses as much as digits as its factorization.

64507987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 423360, while the sum is 46.

The square root of 64507987 is about 8031.6864356124. The cubic root of 64507987 is about 401.0555185018.

The spelling of 64507987 in words is "sixty-four million, five hundred seven thousand, nine hundred eighty-seven".