64890280 has 64 divisors (see below), whose sum is σ = 179706240. Its totient is φ = 20535552.

The previous prime is 64890271. The next prime is 64890281. The reversal of 64890280 is 8209846.

It is not an unprimeable number, because it can be changed into a prime (64890281) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5274 + ... + 12553.

It is an arithmetic number, because the mean of its divisors is an integer number (2807910).

Almost surely, 2^64890280 is an apocalyptic number.

It is an amenable number.

64890280 is an abundant number, since it is smaller than the sum of its proper divisors (114815960).

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

64890280 is a wasteful number, since it uses less digits than its factorization.

64890280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17858 (or 17854 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 37.

The square root of 64890280 is about 8055.4503288146. The cubic root of 64890280 is about 401.8462156097.

The spelling of 64890280 in words is "sixty-four million, eight hundred ninety thousand, two hundred eighty".