78261036920 has 128 divisors (see below), whose sum is σ = 199135272960. Its totient is φ = 27430018560.

The previous prime is 78261036907. The next prime is 78261036929. The reversal of 78261036920 is 2963016287.

It is a super-2 number, since 2×78261036920² (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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78261036929) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1719497 + ... + 1764423.

It is an arithmetic number, because the mean of its divisors is an integer number (1555744320).

Almost surely, 2^78261036920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78261036920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99567636480).

78261036920 is an abundant number, since it is smaller than the sum of its proper divisors (120874236040).

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

78261036920 is a wasteful number, since it uses less digits than its factorization.

78261036920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45093 (or 45089 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 44.

The spelling of 78261036920 in words is "seventy-eight billion, two hundred sixty-one million, thirty-six thousand, nine hundred twenty".