689879070787 has 8 divisors (see below), whose sum is σ = 730496034576. Its totient is φ = 649266089472.

The previous prime is 689879070781. The next prime is 689879070809. The reversal of 689879070787 is 787070978986.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-689879070787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (689879070781) 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, 635233 + ... + 1335394.

It is an arithmetic number, because the mean of its divisors is an integer number (91312004322).

Almost surely, 2^689879070787 is an apocalyptic number.

689879070787 is a deficient number, since it is larger than the sum of its proper divisors (40616963789).

689879070787 is a wasteful number, since it uses less digits than its factorization.

689879070787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1991237.

The product of its (nonzero) digits is 597445632, while the sum is 76.

The spelling of 689879070787 in words is "six hundred eighty-nine billion, eight hundred seventy-nine million, seventy thousand, seven hundred eighty-seven".