840657386604 has 72 divisors (see below), whose sum is σ = 2284047378480. Its totient is φ = 239949609984.

The previous prime is 840657386549. The next prime is 840657386651. The reversal of 840657386604 is 406683756048.

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, 115177 + ... + 1301760.

Almost surely, 2^840657386604 is an apocalyptic number.

840657386604 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 840657386604, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142023689240).

840657386604 is an abundant number, since it is smaller than the sum of its proper divisors (1443389991876).

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

840657386604 is a wasteful number, since it uses less digits than its factorization.

840657386604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1417967 (or 1417958 counting only the distinct ones).

The product of its (nonzero) digits is 23224320, while the sum is 57.

The spelling of 840657386604 in words is "eight hundred forty billion, six hundred fifty-seven million, three hundred eighty-six thousand, six hundred four".