669257760 has 192 divisors, whose sum is σ = 2231276544. Its totient is φ = 168345600.

The previous prime is 669257759. The next prime is 669257777. The reversal of 669257760 is 67752966.

669257760 = 166² + 167² + ... + 1262².

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 609532 + ... + 610628.

It is an arithmetic number, because the mean of its divisors is an integer number (11621232).

Almost surely, 2^669257760 is an apocalyptic number.

669257760 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669257760, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1115638272).

669257760 is an abundant number, since it is smaller than the sum of its proper divisors (1562018784).

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

669257760 is a wasteful number, since it uses less digits than its factorization.

669257760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1187 (or 1179 counting only the distinct ones).

The product of its (nonzero) digits is 952560, while the sum is 48.

The square root of 669257760 is about 25870.0166215640. The cubic root of 669257760 is about 874.7107658999.

The spelling of 669257760 in words is "six hundred sixty-nine million, two hundred fifty-seven thousand, seven hundred sixty".