668074428 has 216 divisors, whose sum is σ = 2137873920. Its totient is φ = 174726720.

The previous prime is 668074427. The next prime is 668074471. The reversal of 668074428 is 824470866.

It is a super-3 number, since 3×668074428³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (668074427) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1038675 + ... + 1039317.

Almost surely, 2^668074428 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 668074428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1068936960).

668074428 is an abundant number, since it is smaller than the sum of its proper divisors (1469799492).

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

668074428 is a wasteful number, since it uses less digits than its factorization.

668074428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 705 counting only the distinct ones).

The product of its (nonzero) digits is 516096, while the sum is 45.

The square root of 668074428 is about 25847.1357794244. The cubic root of 668074428 is about 874.1949288296.

The spelling of 668074428 in words is "six hundred sixty-eight million, seventy-four thousand, four hundred twenty-eight".