669089280 has 80 divisors (see below), whose sum is σ = 2139019344. Its totient is φ = 178421760.

The previous prime is 669089279. The next prime is 669089293. The reversal of 669089280 is 82980966.

It is a tau number, because it is divible by the number of its divisors (80).

It is a super-2 number, since 2×669089280² = 895360929221836800, which contains 22 as substring.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35881 + ... + 51240.

Almost surely, 2^669089280 is an apocalyptic number.

669089280 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

669089280 is an abundant number, since it is smaller than the sum of its proper divisors (1469930064).

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

669089280 is an equidigital number, since it uses as much as digits as its factorization.

669089280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87147 (or 87131 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 48.

The square root of 669089280 is about 25866.7601372882. The cubic root of 669089280 is about 874.6373593855.

The spelling of 669089280 in words is "six hundred sixty-nine million, eighty-nine thousand, two hundred eighty".