78872522 has 4 divisors (see below), whose sum is σ = 118308786. Its totient is φ = 39436260.

The previous prime is 78872501. The next prime is 78872539. The reversal of 78872522 is 22527887.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 78872161 + 361 = 8881^2 + 19^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 78872522.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19718129 + ... + 19718132.

Almost surely, 2^78872522 is an apocalyptic number.

78872522 is a deficient number, since it is larger than the sum of its proper divisors (39436264).

78872522 is a wasteful number, since it uses less digits than its factorization.

78872522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39436263.

The product of its digits is 125440, while the sum is 41.

The square root of 78872522 is about 8881.0203242645. The cubic root of 78872522 is about 428.8531219284.

The spelling of 78872522 in words is "seventy-eight million, eight hundred seventy-two thousand, five hundred twenty-two".