660423408 has 80 divisors (see below), whose sum is σ = 1772032416. Its totient is φ = 211783680.

The previous prime is 660423389. The next prime is 660423457. The reversal of 660423408 is 804324066.

660423408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

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, 141366 + ... + 145962.

Almost surely, 2^660423408 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 660423408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (886016208).

660423408 is an abundant number, since it is smaller than the sum of its proper divisors (1111609008).

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

660423408 is a wasteful number, since it uses less digits than its factorization.

660423408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4722 (or 4716 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 660423408 is about 25698.7044031406. The cubic root of 660423408 is about 870.8449130994.

The spelling of 660423408 in words is "six hundred sixty million, four hundred twenty-three thousand, four hundred eight".