687025780 has 48 divisors (see below), whose sum is σ = 1665893376. Its totient is φ = 233118720.

The previous prime is 687025771. The next prime is 687025793. The reversal of 687025780 is 87520786.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11716 + ... + 38875.

It is an arithmetic number, because the mean of its divisors is an integer number (34706112).

Almost surely, 2^687025780 is an apocalyptic number.

It is an amenable number.

687025780 is an abundant number, since it is smaller than the sum of its proper divisors (978867596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

687025780 is a wasteful number, since it uses less digits than its factorization.

687025780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50704 (or 50702 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 43.

The square root of 687025780 is about 26211.1766237229. The cubic root of 687025780 is about 882.3841084538.

The spelling of 687025780 in words is "six hundred eighty-seven million, twenty-five thousand, seven hundred eighty".