669030040 has 64 divisors (see below), whose sum is σ = 1729152000. Its totient is φ = 228210048.

The previous prime is 669030017. The next prime is 669030059. The reversal of 669030040 is 40030966.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a junction number, because it is equal to n+sod(n) for n = 669029990 and 669030008.

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, 49717 + ... + 61723.

It is an arithmetic number, because the mean of its divisors is an integer number (27018000).

Almost surely, 2^669030040 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 669030040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (864576000).

669030040 is an abundant number, since it is smaller than the sum of its proper divisors (1060121960).

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

669030040 is a wasteful number, since it uses less digits than its factorization.

669030040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12224 (or 12220 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 669030040 is about 25865.6150129859. The cubic root of 669030040 is about 874.6115456673.

The spelling of 669030040 in words is "six hundred sixty-nine million, thirty thousand, forty".