78222781512 has 60 divisors (see below), whose sum is σ = 219116159955. Its totient is φ = 26071887312.

The previous prime is 78222781493. The next prime is 78222781573. The reversal of 78222781512 is 21518722287.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in only one way, i.e., 39111390756 + 39111390756 = 197766^2 + 197766^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=197766.

It is a super-2 number, since 2×78222781512² (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 14 ways as a sum of consecutive naturals, for example, 7114083 + ... + 7125069.

Almost surely, 2^78222781512 is an apocalyptic number.

78222781512 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78222781512 is an abundant number, since it is smaller than the sum of its proper divisors (140893378443).

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

78222781512 is an frugal number, since it uses more digits than its factorization.

78222781512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21992 (or 10992 counting only the distinct ones).

The product of its digits is 250880, while the sum is 45.

The spelling of 78222781512 in words is "seventy-eight billion, two hundred twenty-two million, seven hundred eighty-one thousand, five hundred twelve".