684642768540 has 48 divisors (see below), whose sum is σ = 1921194576672. Its totient is φ = 182171897856.

The previous prime is 684642768503. The next prime is 684642768581. The reversal of 684642768540 is 45867246486.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 12456949 + ... + 12511788.

It is an arithmetic number, because the mean of its divisors is an integer number (40024887014).

Almost surely, 2^684642768540 is an apocalyptic number.

684642768540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

684642768540 is an abundant number, since it is smaller than the sum of its proper divisors (1236551808132).

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

684642768540 is a wasteful number, since it uses less digits than its factorization.

684642768540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24969206 (or 24969204 counting only the distinct ones).

The product of its (nonzero) digits is 61931520, while the sum is 60.

The spelling of 684642768540 in words is "six hundred eighty-four billion, six hundred forty-two million, seven hundred sixty-eight thousand, five hundred forty".