78113661220 has 96 divisors (see below), whose sum is σ = 195955200000. Its totient is φ = 25574001024.

The previous prime is 78113661217. The next prime is 78113661253. The reversal of 78113661220 is 2216631187.

It is a super-2 number, since 2×78113661220² (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 78113661220.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1908531 + ... + 1949029.

It is an arithmetic number, because the mean of its divisors is an integer number (2041200000).

Almost surely, 2^78113661220 is an apocalyptic number.

78113661220 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78113661220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97977600000).

78113661220 is an abundant number, since it is smaller than the sum of its proper divisors (117841538780).

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

78113661220 is a wasteful number, since it uses less digits than its factorization.

78113661220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41137 (or 41135 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 37.

The spelling of 78113661220 in words is "seventy-eight billion, one hundred thirteen million, six hundred sixty-one thousand, two hundred twenty".