664299076 has 45 divisors (see below), whose sum is σ = 1361372831. Its totient is φ = 283617096.

The previous prime is 664299059. The next prime is 664299079. The reversal of 664299076 is 670992466.

The square root of 664299076 is 25774.

It is a perfect power (a square), and thus also a powerful number.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (664299079) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 2525721 + ... + 2525983.

Almost surely, 2^664299076 is an apocalyptic number.

664299076 is the 25774-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 664299076

664299076 is an abundant number, since it is smaller than the sum of its proper divisors (697073755).

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

664299076 is an frugal number, since it uses more digits than its factorization.

664299076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 558 (or 272 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 49.

The cubic root of 664299076 is about 872.5450976271.

Multiplying 664299076 by its sum of digits (49), we get a square (32550654724 = 180418²).

664299076 divided by its sum of digits (49) gives a square (13557124 = 3682²).

The spelling of 664299076 in words is "six hundred sixty-four million, two hundred ninety-nine thousand, seventy-six".