78082172 has 48 divisors (see below), whose sum is σ = 165258240. Its totient is φ = 31534272.

The previous prime is 78082159. The next prime is 78082189. The reversal of 78082172 is 27128087.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168413 + ... + 168875.

It is an arithmetic number, because the mean of its divisors is an integer number (3442880).

Almost surely, 2^78082172 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78082172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82629120).

78082172 is an abundant number, since it is smaller than the sum of its proper divisors (87176068).

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

78082172 is a wasteful number, since it uses less digits than its factorization.

78082172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 808 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 35.

The square root of 78082172 is about 8836.4117151704. The cubic root of 78082172 is about 427.4158552171.

The spelling of 78082172 in words is "seventy-eight million, eighty-two thousand, one hundred seventy-two".