78402940056 has 96 divisors (see below), whose sum is σ = 243000076800. Its totient is φ = 22370904000.

The previous prime is 78402940037. The next prime is 78402940073. The reversal of 78402940056 is 65004920487.

It is a happy number.

It is a super-2 number, since 2×78402940056² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78402939993 and 78402940020.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 274935 + ... + 482073.

It is an arithmetic number, because the mean of its divisors is an integer number (2531250800).

Almost surely, 2^78402940056 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 78402940056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121500038400).

78402940056 is an abundant number, since it is smaller than the sum of its proper divisors (164597136744).

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

78402940056 is a wasteful number, since it uses less digits than its factorization.

78402940056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207909 (or 207902 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 78402940056 in words is "seventy-eight billion, four hundred two million, nine hundred forty thousand, fifty-six".