64890592 has 60 divisors (see below), whose sum is σ = 140348376. Its totient is φ = 29527680.

The previous prime is 64890587. The next prime is 64890599. The reversal of 64890592 is 29509846.

It is a super-2 number, since 2×64890592² = 8421577860220928, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64890599) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 913917 + ... + 913987.

Almost surely, 2^64890592 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64890592, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70174188).

64890592 is an abundant number, since it is smaller than the sum of its proper divisors (75457784).

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

64890592 is an frugal number, since it uses more digits than its factorization.

64890592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133 (or 86 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 64890592 is about 8055.4696945616. The cubic root of 64890592 is about 401.8468596498.

The spelling of 64890592 in words is "sixty-four million, eight hundred ninety thousand, five hundred ninety-two".