78015242 has 8 divisors (see below), whose sum is σ = 117112932. Its totient is φ = 38977600.

The previous prime is 78015229. The next prime is 78015247. The reversal of 78015242 is 24251087.

It can be written as a sum of positive squares in 2 ways, for example, as 76195441 + 1819801 = 8729^2 + 1349^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (78015247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11609 + ... + 17052.

Almost surely, 2^78015242 is an apocalyptic number.

78015242 is a deficient number, since it is larger than the sum of its proper divisors (39097690).

78015242 is a wasteful number, since it uses less digits than its factorization.

78015242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30024.

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 78015242 is about 8832.6237325044. The cubic root of 78015242 is about 427.2936970681.

The spelling of 78015242 in words is "seventy-eight million, fifteen thousand, two hundred forty-two".