78379139436 has 24 divisors (see below), whose sum is σ = 196952709744. Its totient is φ = 24116658240.

The previous prime is 78379139429. The next prime is 78379139471. The reversal of 78379139436 is 63493197387.

It is a happy number.

It is a super-2 number, since 2×78379139436² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78379139436.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 251215035 + ... + 251215346.

It is an arithmetic number, because the mean of its divisors is an integer number (8206362906).

Almost surely, 2^78379139436 is an apocalyptic number.

It is an amenable number.

78379139436 is an abundant number, since it is smaller than the sum of its proper divisors (118573570308).

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

78379139436 is a wasteful number, since it uses less digits than its factorization.

78379139436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 502430401 (or 502430399 counting only the distinct ones).

The product of its digits is 20575296, while the sum is 60.

The spelling of 78379139436 in words is "seventy-eight billion, three hundred seventy-nine million, one hundred thirty-nine thousand, four hundred thirty-six".