64404280 has 16 divisors (see below), whose sum is σ = 144909720. Its totient is φ = 25761696.

The previous prime is 64404271. The next prime is 64404287. The reversal of 64404280 is 8240446.

It is a super-2 number, since 2×64404280² = 8295822564636800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64404287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 805014 + ... + 805093.

Almost surely, 2^64404280 is an apocalyptic number.

It is an amenable number.

64404280 is an abundant number, since it is smaller than the sum of its proper divisors (80505440).

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

64404280 is a wasteful number, since it uses less digits than its factorization.

64404280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1610118 (or 1610114 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 28.

The square root of 64404280 is about 8025.2277226257. The cubic root of 64404280 is about 400.8404827350.

The spelling of 64404280 in words is "sixty-four million, four hundred four thousand, two hundred eighty".