687940279 has 8 divisors (see below), whose sum is σ = 742412160. Its totient is φ = 633690336.

The previous prime is 687940261. The next prime is 687940307. The reversal of 687940279 is 972049786.

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 687940279 - 2⁹ = 687939767 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 (687940579) 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, 49012 + ... + 61465.

It is an arithmetic number, because the mean of its divisors is an integer number (92801520).

Almost surely, 2^687940279 is an apocalyptic number.

687940279 is a deficient number, since it is larger than the sum of its proper divisors (54471881).

687940279 is a wasteful number, since it uses less digits than its factorization.

687940279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110969.

The product of its (nonzero) digits is 1524096, while the sum is 52.

The square root of 687940279 is about 26228.6156516123. The cubic root of 687940279 is about 882.7754482619.

The spelling of 687940279 in words is "six hundred eighty-seven million, nine hundred forty thousand, two hundred seventy-nine".