668698524 has 72 divisors (see below), whose sum is σ = 1877331120. Its totient is φ = 205747776.

The previous prime is 668698523. The next prime is 668698567. The reversal of 668698524 is 425896866.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668698523) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 67 + ... + 36570.

Almost surely, 2^668698524 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 668698524, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (938665560).

668698524 is an abundant number, since it is smaller than the sum of its proper divisors (1208632596).

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

668698524 is a wasteful number, since it uses less digits than its factorization.

668698524 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36676 (or 36655 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 668698524 is about 25859.2057882681. The cubic root of 668698524 is about 874.4670600646.

The spelling of 668698524 in words is "six hundred sixty-eight million, six hundred ninety-eight thousand, five hundred twenty-four".