664535242 has 8 divisors (see below), whose sum is σ = 1139203296. Its totient is φ = 284800812.

The previous prime is 664535237. The next prime is 664535243. The reversal of 664535242 is 242535466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (664535243) 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, 23733388 + ... + 23733415.

It is an arithmetic number, because the mean of its divisors is an integer number (142400412).

Almost surely, 2^664535242 is an apocalyptic number.

664535242 is a deficient number, since it is larger than the sum of its proper divisors (474668054).

664535242 is a wasteful number, since it uses less digits than its factorization.

664535242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47466812.

The product of its digits is 172800, while the sum is 37.

The square root of 664535242 is about 25778.5810703382. The cubic root of 664535242 is about 872.6484853321.

The spelling of 664535242 in words is "six hundred sixty-four million, five hundred thirty-five thousand, two hundred forty-two".