78129159020 has 24 divisors (see below), whose sum is σ = 178986801168. Its totient is φ = 28410603200.

The previous prime is 78129159013. The next prime is 78129159023. The reversal of 78129159020 is 2095192187.

It is a happy number.

It is a super-2 number, since 2×78129159020² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (78129159023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 177566051 + ... + 177566490.

It is an arithmetic number, because the mean of its divisors is an integer number (7457783382).

Almost surely, 2^78129159020 is an apocalyptic number.

It is an amenable number.

78129159020 is an abundant number, since it is smaller than the sum of its proper divisors (100857642148).

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

78129159020 is a wasteful number, since it uses less digits than its factorization.

78129159020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 355132561 (or 355132559 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 44.

The spelling of 78129159020 in words is "seventy-eight billion, one hundred twenty-nine million, one hundred fifty-nine thousand, twenty".