669936787 has 6 divisors (see below), whose sum is σ = 725434692. Its totient is φ = 618403032.

The previous prime is 669936779. The next prime is 669936829. The reversal of 669936787 is 787639966.

It is not a de Polignac number, because 669936787 - 2³ = 669936779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (669936727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1981893 + ... + 1982230.

It is an arithmetic number, because the mean of its divisors is an integer number (120905782).

Almost surely, 2^669936787 is an apocalyptic number.

669936787 is a deficient number, since it is larger than the sum of its proper divisors (55497905).

669936787 is a wasteful number, since it uses less digits than its factorization.

669936787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3964149 (or 3964136 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 61.

The square root of 669936787 is about 25883.1371166634. The cubic root of 669936787 is about 875.0064922511.

The spelling of 669936787 in words is "six hundred sixty-nine million, nine hundred thirty-six thousand, seven hundred eighty-seven".