78239424 has 56 divisors (see below), whose sum is σ = 209192368. Its totient is φ = 25804800.

The previous prime is 78239417. The next prime is 78239449. The reversal of 78239424 is 42493287.

It is a super-2 number, since 2×78239424² = 12242814935703552, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16524 + ... + 20724.

It is an arithmetic number, because the mean of its divisors is an integer number (3735578).

Almost surely, 2^78239424 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 78239424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104596184).

78239424 is an abundant number, since it is smaller than the sum of its proper divisors (130952944).

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

78239424 is a wasteful number, since it uses less digits than its factorization.

78239424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4313 (or 4303 counting only the distinct ones).

The product of its digits is 96768, while the sum is 39.

The square root of 78239424 is about 8845.3051954130. The cubic root of 78239424 is about 427.7025912999.

The spelling of 78239424 in words is "seventy-eight million, two hundred thirty-nine thousand, four hundred twenty-four".