64696987 has 2 divisors, whose sum is σ = 64696988. Its totient is φ = 64696986.

The previous prime is 64696903. The next prime is 64696997. The reversal of 64696987 is 78969646.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 64696987 - 2¹¹ = 64694939 is a prime.

It is not a weakly prime, because it can be changed into another prime (64696997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32348493 + 32348494.

It is an arithmetic number, because the mean of its divisors is an integer number (32348494).

Almost surely, 2^64696987 is an apocalyptic number.

64696987 is a deficient number, since it is larger than the sum of its proper divisors (1).

64696987 is an equidigital number, since it uses as much as digits as its factorization.

64696987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3919104, while the sum is 55.

The square root of 64696987 is about 8043.4437276579. The cubic root of 64696987 is about 401.4468167437.

It can be divided in two parts, 6469 and 6987, that added together give a square (13456 = 116²).

The spelling of 64696987 in words is "sixty-four million, six hundred ninety-six thousand, nine hundred eighty-seven".