78812140 has 72 divisors (see below), whose sum is σ = 188359920. Its totient is φ = 27646080.

The previous prime is 78812131. The next prime is 78812161. The reversal of 78812140 is 4121887.

It is a super-2 number, since 2×78812140² = 12422706822759200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 69619 + ... + 70741.

It is an arithmetic number, because the mean of its divisors is an integer number (2616110).

Almost surely, 2^78812140 is an apocalyptic number.

78812140 is the 5615-th heptagonal number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78812140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94179960).

78812140 is an abundant number, since it is smaller than the sum of its proper divisors (109547780).

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

78812140 is a wasteful number, since it uses less digits than its factorization.

78812140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1183 (or 1170 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 31.

The square root of 78812140 is about 8877.6201766014. The cubic root of 78812140 is about 428.7436557525.

It can be divided in two parts, 78 and 812140, that added together give a palindrome (812218).

The spelling of 78812140 in words is "seventy-eight million, eight hundred twelve thousand, one hundred forty".