669765078 has 16 divisors (see below), whose sum is σ = 1488366960. Its totient is φ = 223255008.

The previous prime is 669765073. The next prime is 669765079. The reversal of 669765078 is 870567966.

It is a happy number.

669765078 is a `hidden beast` number, since 6 + 69 + 76 + 507 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54), and also a Moran number because the ratio is a prime number: 12403057 = 669765078 / (6 + 6 + 9 + 7 + 6 + 5 + 0 + 7 + 8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669765071) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6201475 + ... + 6201582.

It is an arithmetic number, because the mean of its divisors is an integer number (93022935).

Almost surely, 2^669765078 is an apocalyptic number.

669765078 is an abundant number, since it is smaller than the sum of its proper divisors (818601882).

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

669765078 is a wasteful number, since it uses less digits than its factorization.

669765078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12403068 (or 12403062 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 54.

The square root of 669765078 is about 25879.8198989097. The cubic root of 669765078 is about 874.9317293129.

The spelling of 669765078 in words is "six hundred sixty-nine million, seven hundred sixty-five thousand, seventy-eight".