664451400 has 48 divisors (see below), whose sum is σ = 2059801200. Its totient is φ = 177186880.

The previous prime is 664451387. The next prime is 664451419. The reversal of 664451400 is 4154466.

664451400 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 553110 + ... + 554309.

It is an arithmetic number, because the mean of its divisors is an integer number (42912525).

Almost surely, 2^664451400 is an apocalyptic number.

664451400 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

664451400 is an abundant number, since it is smaller than the sum of its proper divisors (1395349800).

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

664451400 is a wasteful number, since it uses less digits than its factorization.

664451400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107438 (or 1107429 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 30.

The square root of 664451400 is about 25776.9548240284. The cubic root of 664451400 is about 872.6117841577.

The spelling of 664451400 in words is "six hundred sixty-four million, four hundred fifty-one thousand, four hundred".