7564389664 has 24 divisors (see below), whose sum is σ = 16037961660. Its totient is φ = 3491256576.

The previous prime is 7564389653. The next prime is 7564389691. The reversal of 7564389664 is 4669834657.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 7516890000 + 47499664 = 86700^2 + 6892^2 .

It is a junction number, because it is equal to n+sod(n) for n = 7564389599 and 7564389608.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9091399 + ... + 9092230.

Almost surely, 2^7564389664 is an apocalyptic number.

It is an amenable number.

7564389664 is an abundant number, since it is smaller than the sum of its proper divisors (8473571996).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

7564389664 is a wasteful number, since it uses less digits than its factorization.

7564389664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18183652 (or 18183644 counting only the distinct ones).

The product of its digits is 26127360, while the sum is 58.

The square root of 7564389664 is about 86973.4997801054. The cubic root of 7564389664 is about 1963.0195772187.

The spelling of 7564389664 in words is "seven billion, five hundred sixty-four million, three hundred eighty-nine thousand, six hundred sixty-four".