64889320 has 16 divisors (see below), whose sum is σ = 146001060. Its totient is φ = 25955712.

The previous prime is 64889291. The next prime is 64889333. The reversal of 64889320 is 2398846.

It can be written as a sum of positive squares in 2 ways, for example, as 62821476 + 2067844 = 7926^2 + 1438^2 .

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 1622233 = 64889320 / (6 + 4 + 8 + 8 + 9 + 3 + 2 + 0).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 811077 + ... + 811156.

Almost surely, 2^64889320 is an apocalyptic number.

It is an amenable number.

64889320 is an abundant number, since it is smaller than the sum of its proper divisors (81111740).

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

64889320 is a wasteful number, since it uses less digits than its factorization.

64889320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1622244 (or 1622240 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 40.

The square root of 64889320 is about 8055.3907416090. The cubic root of 64889320 is about 401.8442339351.

The spelling of 64889320 in words is "sixty-four million, eight hundred eighty-nine thousand, three hundred twenty".