78685044 has 48 divisors (see below), whose sum is σ = 195564096. Its totient is φ = 24537600.

The previous prime is 78684997. The next prime is 78685049. The reversal of 78685044 is 44058687.

It is a super-2 number, since 2×78685044² = 12382672298563872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 78684987 and 78685005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78685049) 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, 35859 + ... + 37989.

It is an arithmetic number, because the mean of its divisors is an integer number (4074252).

Almost surely, 2^78685044 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 78685044, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97782048).

78685044 is an abundant number, since it is smaller than the sum of its proper divisors (116879052).

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

78685044 is a wasteful number, since it uses less digits than its factorization.

78685044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2336 (or 2334 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 78685044 is about 8870.4590636562. The cubic root of 78685044 is about 428.5130613212.

The spelling of 78685044 in words is "seventy-eight million, six hundred eighty-five thousand, forty-four".