669402887 has 8 divisors (see below), whose sum is σ = 686476560. Its totient is φ = 652397760.

The previous prime is 669402883. The next prime is 669402901. The reversal of 669402887 is 788204966.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 669402887 - 2² = 669402883 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (669402883) 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, 2939 + ... + 36707.

It is an arithmetic number, because the mean of its divisors is an integer number (85809570).

Almost surely, 2^669402887 is an apocalyptic number.

669402887 is a deficient number, since it is larger than the sum of its proper divisors (17073673).

669402887 is a wasteful number, since it uses less digits than its factorization.

669402887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34273.

The product of its (nonzero) digits is 1161216, while the sum is 50.

The square root of 669402887 is about 25872.8213962065. The cubic root of 669402887 is about 874.7739876669.

The spelling of 669402887 in words is "six hundred sixty-nine million, four hundred two thousand, eight hundred eighty-seven".