687779928049 has 8 divisors (see below), whose sum is σ = 690387684032. Its totient is φ = 685175364720.

The previous prime is 687779928029. The next prime is 687779928053. The reversal of 687779928049 is 940829977786.

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 687779928049 - 2¹⁵ = 687779895281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (687779928019) 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, 366054 + ... + 1228639.

It is an arithmetic number, because the mean of its divisors is an integer number (86298460504).

Almost surely, 2^687779928049 is an apocalyptic number.

It is an amenable number.

687779928049 is a deficient number, since it is larger than the sum of its proper divisors (2607755983).

687779928049 is a wasteful number, since it uses less digits than its factorization.

687779928049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1596327.

The product of its (nonzero) digits is 768144384, while the sum is 76.

The spelling of 687779928049 in words is "six hundred eighty-seven billion, seven hundred seventy-nine million, nine hundred twenty-eight thousand, forty-nine".