878165421428736 has 1053 divisors, whose sum is σ = 3136956063041619. Its totient is φ = 235963252998144.

The previous prime is 878165421428731. The next prime is 878165421428783. The reversal of 878165421428736 is 637824124561878.

The square root of 878165421428736 is 29633856.

It is a perfect power (a square), and thus also a powerful number.

878165421428736 is a `hidden beast` number, since 8 + 7 + 8 + 1 + 6 + 542 + 1 + 4 + 2 + 8 + 73 + 6 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 641763726299136 + 236401695129600 = 25333056^2 + 15375360^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (878165421428731) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 677074341240 + ... + 677074342536.

Almost surely, 2^{878165421428736} is an apocalyptic number.

878165421428736 is the 29633856-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 878165421428736

878165421428736 is an abundant number, since it is smaller than the sum of its proper divisors (2258790641612883).

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

878165421428736 is an equidigital number, since it uses as much as digits as its factorization.

878165421428736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2672 (or 1326 counting only the distinct ones).

The product of its digits is 867041280, while the sum is 72.

The spelling of 878165421428736 in words is "eight hundred seventy-eight trillion, one hundred sixty-five billion, four hundred twenty-one million, four hundred twenty-eight thousand, seven hundred thirty-six".