664284280 has 32 divisors (see below), whose sum is σ = 1630517040. Its totient is φ = 241557760.

The previous prime is 664284277. The next prime is 664284287. The reversal of 664284280 is 82482466.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664284287) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 754429 + ... + 755308.

Almost surely, 2^664284280 is an apocalyptic number.

It is an amenable number.

664284280 is an abundant number, since it is smaller than the sum of its proper divisors (966232760).

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

664284280 is a wasteful number, since it uses less digits than its factorization.

664284280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1509759 (or 1509755 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 40.

The square root of 664284280 is about 25773.7129649571. The cubic root of 664284280 is about 872.5386194841.

The spelling of 664284280 in words is "six hundred sixty-four million, two hundred eighty-four thousand, two hundred eighty".