78124391072 has 480 divisors, whose sum is σ = 211315148352. Its totient is φ = 28146327552.

The previous prime is 78124391069. The next prime is 78124391087. The reversal of 78124391072 is 27019342187.

It is a super-2 number, since 2×78124391072² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 730134443 + ... + 730134549.

Almost surely, 2^78124391072 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 78124391072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105657574176).

78124391072 is an abundant number, since it is smaller than the sum of its proper divisors (133190757280).

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

78124391072 is a wasteful number, since it uses less digits than its factorization.

78124391072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218 (or 189 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 44.

The spelling of 78124391072 in words is "seventy-eight billion, one hundred twenty-four million, three hundred ninety-one thousand, seventy-two".