7857023655840 has 96 divisors (see below), whose sum is σ = 24754081899456. Its totient is φ = 2094828963840.

The previous prime is 7857023655809. The next prime is 7857023655857. The reversal of 7857023655840 is 485563207587.

It is a tau number, because it is divible by the number of its divisors (96).

It is a super-2 number, since 2×7857023655840² (a number of 27 digits) contains 22 as substring.

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

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, 1199020 + ... + 4141460.

It is an arithmetic number, because the mean of its divisors is an integer number (257855019786).

Almost surely, 2^{7857023655840} is an apocalyptic number.

It is an amenable number.

7857023655840 is an abundant number, since it is smaller than the sum of its proper divisors (16897058243616).

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

7857023655840 is a wasteful number, since it uses less digits than its factorization.

7857023655840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2948022 (or 2948014 counting only the distinct ones).

The product of its (nonzero) digits is 56448000, while the sum is 60.

The spelling of 7857023655840 in words is "seven trillion, eight hundred fifty-seven billion, twenty-three million, six hundred fifty-five thousand, eight hundred forty".