78221012144 has 60 divisors (see below), whose sum is σ = 174490517160. Its totient is φ = 33683662080.

The previous prime is 78221012137. The next prime is 78221012159. The reversal of 78221012144 is 44121012287.

It is a super-2 number, since 2×78221012144² (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 78221012144.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 552029 + ... + 679100.

It is an arithmetic number, because the mean of its divisors is an integer number (2908175286).

Almost surely, 2^78221012144 is an apocalyptic number.

It is an amenable number.

78221012144 is an abundant number, since it is smaller than the sum of its proper divisors (96269505016).

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

78221012144 is a wasteful number, since it uses less digits than its factorization.

78221012144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231186 (or 1231161 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The spelling of 78221012144 in words is "seventy-eight billion, two hundred twenty-one million, twelve thousand, one hundred forty-four".