664767400 has 48 divisors (see below), whose sum is σ = 1686097440. Its totient is φ = 241732800.

The previous prime is 664767373. The next prime is 664767431. The reversal of 664767400 is 4767466.

It is a super-2 number, since 2×664767400² = 883831392205520000, which contains 22 as substring.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148884 + ... + 153283.

It is an arithmetic number, because the mean of its divisors is an integer number (35127030).

Almost surely, 2^664767400 is an apocalyptic number.

It is an amenable number.

664767400 is an abundant number, since it is smaller than the sum of its proper divisors (1021330040).

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

664767400 is a wasteful number, since it uses less digits than its factorization.

664767400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302194 (or 302185 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 40.

The square root of 664767400 is about 25783.0836014624. The cubic root of 664767400 is about 872.7500945605.

It can be divided in two parts, 6647 and 67400, that added together give a palindrome (74047).

The spelling of 664767400 in words is "six hundred sixty-four million, seven hundred sixty-seven thousand, four hundred".