687812828 has 12 divisors (see below), whose sum is σ = 1215590712. Its totient is φ = 340501200.

The previous prime is 687812819. The next prime is 687812831. The reversal of 687812828 is 828218786.

It is a super-2 number, since 2×687812828² = 946172972722715168, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 850850 + ... + 851657.

It is an arithmetic number, because the mean of its divisors is an integer number (101299226).

Almost surely, 2^687812828 is an apocalyptic number.

It is an amenable number.

687812828 is a deficient number, since it is larger than the sum of its proper divisors (527777884).

687812828 is a wasteful number, since it uses less digits than its factorization.

687812828 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1702612 (or 1702610 counting only the distinct ones).

The product of its digits is 688128, while the sum is 50.

The square root of 687812828 is about 26226.1859217081. The cubic root of 687812828 is about 882.7209292065.

The spelling of 687812828 in words is "six hundred eighty-seven million, eight hundred twelve thousand, eight hundred twenty-eight".