78864242 has 8 divisors (see below), whose sum is σ = 121493676. Its totient is φ = 38366352.

The previous prime is 78864229. The next prime is 78864257. The reversal of 78864242 is 24246887.

It can be written as a sum of positive squares in 2 ways, for example, as 78517321 + 346921 = 8861^2 + 589^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 78864242.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 532793 + ... + 532940.

Almost surely, 2^78864242 is an apocalyptic number.

78864242 is a deficient number, since it is larger than the sum of its proper divisors (42629434).

78864242 is a wasteful number, since it uses less digits than its factorization.

78864242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1065772.

The product of its digits is 172032, while the sum is 41.

The square root of 78864242 is about 8880.5541493760. The cubic root of 78864242 is about 428.8381144707.

The spelling of 78864242 in words is "seventy-eight million, eight hundred sixty-four thousand, two hundred forty-two".