669820887 has 16 divisors (see below), whose sum is σ = 1006306560. Its totient is φ = 440256600.

The previous prime is 669820883. The next prime is 669820891. The reversal of 669820887 is 788028966.

It is an interprime number because it is at equal distance from previous prime (669820883) and next prime (669820891).

It is not a de Polignac number, because 669820887 - 2² = 669820883 is a prime.

It is a super-2 number, since 2×669820887² = 897320041322933538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669820883) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 172789 + ... + 176622.

It is an arithmetic number, because the mean of its divisors is an integer number (62894160).

Almost surely, 2^669820887 is an apocalyptic number.

669820887 is a deficient number, since it is larger than the sum of its proper divisors (336485673).

669820887 is a wasteful number, since it uses less digits than its factorization.

669820887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 349491 (or 349485 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 54.

The square root of 669820887 is about 25880.8981103825. The cubic root of 669820887 is about 874.9560302259.

The spelling of 669820887 in words is "six hundred sixty-nine million, eight hundred twenty thousand, eight hundred eighty-seven".