64715789 has 4 divisors (see below), whose sum is σ = 64936956. Its totient is φ = 64494624.

The previous prime is 64715737. The next prime is 64715801. The reversal of 64715789 is 98751746.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61936900 + 2778889 = 7870^2 + 1667^2 .

It is a cyclic number.

It is not a de Polignac number, because 64715789 - 2¹² = 64711693 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64715089) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 110144 + ... + 110729.

It is an arithmetic number, because the mean of its divisors is an integer number (16234239).

Almost surely, 2^64715789 is an apocalyptic number.

It is an amenable number.

64715789 is a deficient number, since it is larger than the sum of its proper divisors (221167).

64715789 is a wasteful number, since it uses less digits than its factorization.

64715789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221166.

The product of its digits is 423360, while the sum is 47.

The square root of 64715789 is about 8044.6124207447. The cubic root of 64715789 is about 401.4857019753.

The spelling of 64715789 in words is "sixty-four million, seven hundred fifteen thousand, seven hundred eighty-nine".