669774400 has 63 divisors (see below), whose sum is σ = 1650614809. Its totient is φ = 267495680.

The previous prime is 669774383. The next prime is 669774439. The reversal of 669774400 is 4477966.

The square root of 669774400 is 25880.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 241118784 + 428655616 = 15528^2 + 20704^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1034877 + ... + 1035523.

Almost surely, 2^669774400 is an apocalyptic number.

669774400 is the 25880-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669774400

669774400 is an abundant number, since it is smaller than the sum of its proper divisors (980840409).

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

669774400 is an frugal number, since it uses more digits than its factorization.

669774400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316 (or 654 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 43.

The cubic root of 669774400 is about 874.9357884853.

Multiplying 669774400 by its product of nonzero digits (254016), we get a square (170133413990400 = 13043520²).

The spelling of 669774400 in words is "six hundred sixty-nine million, seven hundred seventy-four thousand, four hundred".