78218219625 has 128 divisors (see below), whose sum is σ = 165360599040. Its totient is φ = 31941216000.

The previous prime is 78218219621. The next prime is 78218219647. The reversal of 78218219625 is 52691281287.

It is not a de Polignac number, because 78218219625 - 2² = 78218219621 is a prime.

It is a super-2 number, since 2×78218219625² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78218219621) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1020906 + ... + 1094844.

It is an arithmetic number, because the mean of its divisors is an integer number (1291879680).

Almost surely, 2^78218219625 is an apocalyptic number.

78218219625 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

It is an amenable number.

78218219625 is an abundant number, since it is smaller than the sum of its proper divisors (87142379415).

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

78218219625 is a wasteful number, since it uses less digits than its factorization.

78218219625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74008 (or 73998 counting only the distinct ones).

The product of its digits is 967680, while the sum is 51.

The spelling of 78218219625 in words is "seventy-eight billion, two hundred eighteen million, two hundred nineteen thousand, six hundred twenty-five".