64987567 has 2 divisors, whose sum is σ = 64987568. Its totient is φ = 64987566.

The previous prime is 64987553. The next prime is 64987613. The reversal of 64987567 is 76578946.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 64987567 - 2²³ = 56598959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61987567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32493783 + 32493784.

It is an arithmetic number, because the mean of its divisors is an integer number (32493784).

Almost surely, 2^64987567 is an apocalyptic number.

64987567 is a deficient number, since it is larger than the sum of its proper divisors (1).

64987567 is an equidigital number, since it uses as much as digits as its factorization.

64987567 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2540160, while the sum is 52.

The square root of 64987567 is about 8061.4866494959. The cubic root of 64987567 is about 402.0469384892.

The spelling of 64987567 in words is "sixty-four million, nine hundred eighty-seven thousand, five hundred sixty-seven".