664607424 has 56 divisors (see below), whose sum is σ = 1893712240. Its totient is φ = 204493824.

The previous prime is 664607423. The next prime is 664607429. The reversal of 664607424 is 424706466.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (664607423) 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, 130639 + ... + 135630.

It is an arithmetic number, because the mean of its divisors is an integer number (33816290).

Almost surely, 2^664607424 is an apocalyptic number.

664607424 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

664607424 is an abundant number, since it is smaller than the sum of its proper divisors (1229104816).

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

664607424 is a wasteful number, since it uses less digits than its factorization.

664607424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266297 (or 266287 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 39.

The square root of 664607424 is about 25779.9810705904. The cubic root of 664607424 is about 872.6800799607.

The spelling of 664607424 in words is "six hundred sixty-four million, six hundred seven thousand, four hundred twenty-four".