64578280 has 96 divisors (see below), whose sum is σ = 161867160. Its totient is φ = 23162880.

The previous prime is 64578277. The next prime is 64578281. The reversal of 64578280 is 8287546.

It can be written as a sum of positive squares in 12 ways, for example, as 15382084 + 49196196 = 3922^2 + 7014^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (64578281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 277044 + ... + 277276.

Almost surely, 2^64578280 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 64578280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80933580).

64578280 is an abundant number, since it is smaller than the sum of its proper divisors (97288880).

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

64578280 is a wasteful number, since it uses less digits than its factorization.

64578280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311 (or 294 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 40.

The square root of 64578280 is about 8036.0612242566. The cubic root of 64578280 is about 401.2011395492.

The spelling of 64578280 in words is "sixty-four million, five hundred seventy-eight thousand, two hundred eighty".