669078090 has 32 divisors (see below), whose sum is σ = 1784208960. Its totient is φ = 178420752.

The previous prime is 669078083. The next prime is 669078101. The reversal of 669078090 is 90870966.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

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, 1238764 + ... + 1239303.

It is an arithmetic number, because the mean of its divisors is an integer number (55756530).

Almost surely, 2^669078090 is an apocalyptic number.

669078090 is an abundant number, since it is smaller than the sum of its proper divisors (1115130870).

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

669078090 is a wasteful number, since it uses less digits than its factorization.

669078090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2478083 (or 2478077 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 669078090 is about 25866.5438356190. The cubic root of 669078090 is about 874.6324834809.

The spelling of 669078090 in words is "six hundred sixty-nine million, seventy-eight thousand, ninety".