664743490 has 32 divisors (see below), whose sum is σ = 1224661680. Its totient is φ = 259693824.

The previous prime is 664743487. The next prime is 664743551. The reversal of 664743490 is 94347466.

It can be written as a sum of positive squares in 8 ways, for example, as 657768609 + 6974881 = 25647^2 + 2641^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 118632 + ... + 124108.

Almost surely, 2^664743490 is an apocalyptic number.

664743490 is a deficient number, since it is larger than the sum of its proper divisors (559918190).

664743490 is a wasteful number, since it uses less digits than its factorization.

664743490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5766.

The product of its (nonzero) digits is 435456, while the sum is 43.

The square root of 664743490 is about 25782.6199211795. The cubic root of 664743490 is about 872.7396308981.

The spelling of 664743490 in words is "six hundred sixty-four million, seven hundred forty-three thousand, four hundred ninety".