78061844 has 48 divisors (see below), whose sum is σ = 162570240. Its totient is φ = 32093280.

The previous prime is 78061831. The next prime is 78061847. The reversal of 78061844 is 44816087.

It is a junction number, because it is equal to n+sod(n) for n = 78061798 and 78061807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78061847) 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, 120329 + ... + 120975.

It is an arithmetic number, because the mean of its divisors is an integer number (3386880).

Almost surely, 2^78061844 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 78061844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81285120).

78061844 is an abundant number, since it is smaller than the sum of its proper divisors (84508396).

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

78061844 is a wasteful number, since it uses less digits than its factorization.

78061844 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 828 (or 826 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 38.

The square root of 78061844 is about 8835.2613996418. The cubic root of 78061844 is about 427.3787606905.

The spelling of 78061844 in words is "seventy-eight million, sixty-one thousand, eight hundred forty-four".