78220220568 has 96 divisors (see below), whose sum is σ = 230218148160. Its totient is φ = 22079346240.

The previous prime is 78220220567. The next prime is 78220220569. The reversal of 78220220568 is 86502202287.

It is an interprime number because it is at equal distance from previous prime (78220220567) and next prime (78220220569).

It is a super-2 number, since 2×78220220568² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78220220563) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 303078 + ... + 498293.

It is an arithmetic number, because the mean of its divisors is an integer number (2398105710).

Almost surely, 2^78220220568 is an apocalyptic number.

It is an amenable number.

78220220568 is an abundant number, since it is smaller than the sum of its proper divisors (151997927592).

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

78220220568 is a wasteful number, since it uses less digits than its factorization.

78220220568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801477 (or 801466 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The spelling of 78220220568 in words is "seventy-eight billion, two hundred twenty million, two hundred twenty thousand, five hundred sixty-eight".