64989320 has 32 divisors (see below), whose sum is σ = 159520320. Its totient is φ = 23632320.

The previous prime is 64989307. The next prime is 64989347. The reversal of 64989320 is 2398946.

It is a happy number.

It is a super-2 number, since 2×64989320² = 8447223428124800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73412 + ... + 74291.

It is an arithmetic number, because the mean of its divisors is an integer number (4985010).

Almost surely, 2^64989320 is an apocalyptic number.

It is an amenable number.

64989320 is an abundant number, since it is smaller than the sum of its proper divisors (94531000).

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

64989320 is a wasteful number, since it uses less digits than its factorization.

64989320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147725 (or 147721 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 64989320 is about 8061.5953756065. The cubic root of 64989320 is about 402.0505534470.

The spelling of 64989320 in words is "sixty-four million, nine hundred eighty-nine thousand, three hundred twenty".