78204188172 has 48 divisors (see below), whose sum is σ = 199181453184. Its totient is φ = 23684400000.

The previous prime is 78204188129. The next prime is 78204188173. The reversal of 78204188172 is 27188140287.

It is a super-2 number, since 2×78204188172² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78204188173) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55047 + ... + 399297.

It is an arithmetic number, because the mean of its divisors is an integer number (4149613608).

Almost surely, 2^78204188172 is an apocalyptic number.

It is an amenable number.

78204188172 is an abundant number, since it is smaller than the sum of its proper divisors (120977265012).

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

78204188172 is a wasteful number, since it uses less digits than its factorization.

78204188172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345990 (or 345988 counting only the distinct ones).

The product of its (nonzero) digits is 401408, while the sum is 48.

The spelling of 78204188172 in words is "seventy-eight billion, two hundred four million, one hundred eighty-eight thousand, one hundred seventy-two".