664829698 has 32 divisors (see below), whose sum is σ = 1114288560. Its totient is φ = 295384320.

The previous prime is 664829681. The next prime is 664829699. The reversal of 664829698 is 896928466.

It can be written as a sum of positive squares in 8 ways, for example, as 328950769 + 335878929 = 18137^2 + 18327^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is not an unprimeable number, because it can be changed into a prime (664829699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 298228 + ... + 300448.

Almost surely, 2^664829698 is an apocalyptic number.

664829698 is a deficient number, since it is larger than the sum of its proper divisors (449458862).

664829698 is a wasteful number, since it uses less digits than its factorization.

664829698 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2662.

The product of its digits is 8957952, while the sum is 58.

The square root of 664829698 is about 25784.2916908726. The cubic root of 664829698 is about 872.7773566711. Note that the first 3 decimals are identical.

The spelling of 664829698 in words is "six hundred sixty-four million, eight hundred twenty-nine thousand, six hundred ninety-eight".