687780885 has 16 divisors (see below), whose sum is σ = 1200490560. Its totient is φ = 333469440.

The previous prime is 687780859. The next prime is 687780889. The reversal of 687780885 is 588087786.

It is not a de Polignac number, because 687780885 - 2⁵ = 687780853 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687780889) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2084020 + ... + 2084349.

It is an arithmetic number, because the mean of its divisors is an integer number (75030660).

Almost surely, 2^687780885 is an apocalyptic number.

It is an amenable number.

687780885 is a deficient number, since it is larger than the sum of its proper divisors (512709675).

687780885 is a wasteful number, since it uses less digits than its factorization.

687780885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4168388.

The product of its (nonzero) digits is 6021120, while the sum is 57.

The square root of 687780885 is about 26225.5769240640. The cubic root of 687780885 is about 882.7072640590.

The spelling of 687780885 in words is "six hundred eighty-seven million, seven hundred eighty thousand, eight hundred eighty-five".