669977904 has 80 divisors (see below), whose sum is σ = 1759932000. Its totient is φ = 219598848.

The previous prime is 669977897. The next prime is 669977911. The reversal of 669977904 is 409779966.

It is an interprime number because it is at equal distance from previous prime (669977897) and next prime (669977911).

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, 807762 + ... + 808590.

It is an arithmetic number, because the mean of its divisors is an integer number (21999150).

Almost surely, 2^669977904 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 669977904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (879966000).

669977904 is an abundant number, since it is smaller than the sum of its proper divisors (1089954096).

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

669977904 is a wasteful number, since it uses less digits than its factorization.

669977904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102 (or 1096 counting only the distinct ones).

The product of its (nonzero) digits is 5143824, while the sum is 57.

The square root of 669977904 is about 25883.9313860936. The cubic root of 669977904 is about 875.0243928982.

The spelling of 669977904 in words is "six hundred sixty-nine million, nine hundred seventy-seven thousand, nine hundred four".