7878649958478 has 160 divisors (see below), whose sum is σ = 19074451112640. Its totient is φ = 2416249543680.

The previous prime is 7878649958471. The next prime is 7878649958489. The reversal of 7878649958478 is 8748599468787.

7878649958478 is a `hidden beast` number, since 7 + 8 + 7 + 8 + 6 + 49 + 95 + 8 + 478 = 666.

It is a super-2 number, since 2×7878649958478² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7878649958471) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1169456326 + ... + 1169463062.

It is an arithmetic number, because the mean of its divisors is an integer number (119215319454).

Almost surely, 2^{7878649958478} is an apocalyptic number.

7878649958478 is a gapful number since it is divisible by the number (78) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 7878649958478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9537225556320).

7878649958478 is an abundant number, since it is smaller than the sum of its proper divisors (11195801154162).

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

7878649958478 is a wasteful number, since it uses less digits than its factorization.

7878649958478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8504 (or 8495 counting only the distinct ones).

The product of its digits is 54623600640, while the sum is 90.

The spelling of 7878649958478 in words is "seven trillion, eight hundred seventy-eight billion, six hundred forty-nine million, nine hundred fifty-eight thousand, four hundred seventy-eight".