678997701844 has 72 divisors (see below), whose sum is σ = 1518024866400. Its totient is φ = 262768968000.

The previous prime is 678997701839. The next prime is 678997701871. The reversal of 678997701844 is 448107799876.

It is a super-2 number, since 2×678997701844² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 735582 + ... + 1378069.

It is an arithmetic number, because the mean of its divisors is an integer number (21083678700).

Almost surely, 2^678997701844 is an apocalyptic number.

It is an amenable number.

678997701844 is an abundant number, since it is smaller than the sum of its proper divisors (839027164556).

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

678997701844 is a wasteful number, since it uses less digits than its factorization.

678997701844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2113829 (or 2113820 counting only the distinct ones).

The product of its (nonzero) digits is 170698752, while the sum is 70.

The spelling of 678997701844 in words is "six hundred seventy-eight billion, nine hundred ninety-seven million, seven hundred one thousand, eight hundred forty-four".