664858490 has 8 divisors (see below), whose sum is σ = 1196745300. Its totient is φ = 265943392.

The previous prime is 664858489. The next prime is 664858529. The reversal of 664858490 is 94858466.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 662496121 + 2362369 = 25739^2 + 1537^2 .

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

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33242915 + ... + 33242934.

Almost surely, 2^664858490 is an apocalyptic number.

664858490 is a deficient number, since it is larger than the sum of its proper divisors (531886810).

664858490 is a wasteful number, since it uses less digits than its factorization.

664858490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66485856.

The product of its (nonzero) digits is 1658880, while the sum is 50.

The square root of 664858490 is about 25784.8500092593. The cubic root of 664858490 is about 872.7899557086.

The spelling of 664858490 in words is "six hundred sixty-four million, eight hundred fifty-eight thousand, four hundred ninety".