78740838 has 96 divisors (see below), whose sum is σ = 199648800. Its totient is φ = 22164480.

The previous prime is 78740819. The next prime is 78740843. The reversal of 78740838 is 83804787.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 78740793 and 78740802.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 501456 + ... + 501612.

It is an arithmetic number, because the mean of its divisors is an integer number (2079675).

Almost surely, 2^78740838 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78740838, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99824400).

78740838 is an abundant number, since it is smaller than the sum of its proper divisors (120907962).

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

78740838 is a wasteful number, since it uses less digits than its factorization.

78740838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 342 (or 339 counting only the distinct ones).

The product of its (nonzero) digits is 301056, while the sum is 45.

The square root of 78740838 is about 8873.6034394151. The cubic root of 78740838 is about 428.6143207548.

The spelling of 78740838 in words is "seventy-eight million, seven hundred forty thousand, eight hundred thirty-eight".