669470984 has 64 divisors (see below), whose sum is σ = 1574173440. Its totient is φ = 259833600.

The previous prime is 669470953. The next prime is 669470993. The reversal of 669470984 is 489074966.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (53).

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, 29909 + ... + 47259.

It is an arithmetic number, because the mean of its divisors is an integer number (24596460).

Almost surely, 2^669470984 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 669470984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (787086720).

669470984 is an abundant number, since it is smaller than the sum of its proper divisors (904702456).

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

669470984 is a wasteful number, since it uses less digits than its factorization.

669470984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17430 (or 17426 counting only the distinct ones).

The product of its (nonzero) digits is 2612736, while the sum is 53.

The square root of 669470984 is about 25874.1373576009. The cubic root of 669470984 is about 874.8036496565.

The spelling of 669470984 in words is "six hundred sixty-nine million, four hundred seventy thousand, nine hundred eighty-four".