64437689 has 2 divisors, whose sum is σ = 64437690. Its totient is φ = 64437688.

The previous prime is 64437671. The next prime is 64437749. The reversal of 64437689 is 98673446.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52417600 + 12020089 = 7240^2 + 3467^2 .

It is a cyclic number.

It is not a de Polignac number, because 64437689 - 2¹⁶ = 64372153 is a prime.

It is not a weakly prime, because it can be changed into another prime (64437619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32218844 + 32218845.

It is an arithmetic number, because the mean of its divisors is an integer number (32218845).

Almost surely, 2^64437689 is an apocalyptic number.

It is an amenable number.

64437689 is a deficient number, since it is larger than the sum of its proper divisors (1).

64437689 is an equidigital number, since it uses as much as digits as its factorization.

64437689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 870912, while the sum is 47.

The square root of 64437689 is about 8027.3089513236. The cubic root of 64437689 is about 400.9097812597.

The spelling of 64437689 in words is "sixty-four million, four hundred thirty-seven thousand, six hundred eighty-nine".