669802770 has 288 divisors, whose sum is σ = 2244557952. Its totient is φ = 140714496.

The previous prime is 669802769. The next prime is 669802883. The reversal of 669802770 is 77208966.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 2874574 + ... + 2874806.

It is an arithmetic number, because the mean of its divisors is an integer number (7793604).

Almost surely, 2^669802770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 669802770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1122278976).

669802770 is an abundant number, since it is smaller than the sum of its proper divisors (1574755182).

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

669802770 is a wasteful number, since it uses less digits than its factorization.

669802770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 263 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 669802770 is about 25880.5481008421. The cubic root of 669802770 is about 874.9481416885.

The spelling of 669802770 in words is "six hundred sixty-nine million, eight hundred two thousand, seven hundred seventy".