78715242 has 12 divisors (see below), whose sum is σ = 170549730. Its totient is φ = 26238408.

The previous prime is 78715213. The next prime is 78715267. The reversal of 78715242 is 24251787.

It can be written as a sum of positive squares in only one way, i.e., 54597321 + 24117921 = 7389^2 + 4911^2 .

It is a junction number, because it is equal to n+sod(n) for n = 78715197 and 78715206.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2186517 + ... + 2186552.

Almost surely, 2^78715242 is an apocalyptic number.

78715242 is an abundant number, since it is smaller than the sum of its proper divisors (91834488).

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

78715242 is a wasteful number, since it uses less digits than its factorization.

78715242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4373077 (or 4373074 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 78715242 is about 8872.1610670682. The cubic root of 78715242 is about 428.5678730181.

The spelling of 78715242 in words is "seventy-eight million, seven hundred fifteen thousand, two hundred forty-two".