78749424 has 240 divisors, whose sum is σ = 259983360. Its totient is φ = 22049280.

The previous prime is 78749417. The next prime is 78749441. The reversal of 78749424 is 42494787.

It is a self number, because there is not a number n which added to its sum of digits gives 78749424.

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, 1334707 + ... + 1334765.

It is an arithmetic number, because the mean of its divisors is an integer number (1083264).

Almost surely, 2^78749424 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 78749424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129991680).

78749424 is an abundant number, since it is smaller than the sum of its proper divisors (181233936).

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

78749424 is a wasteful number, since it uses less digits than its factorization.

78749424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140 (or 131 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 78749424 is about 8874.0872206667. The cubic root of 78749424 is about 428.6298990701.

The spelling of 78749424 in words is "seventy-eight million, seven hundred forty-nine thousand, four hundred twenty-four".