78992549 has 4 divisors (see below), whose sum is σ = 81716460. Its totient is φ = 76268640.

The previous prime is 78992513. The next prime is 78992567. The reversal of 78992549 is 94529987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94529987 = 599 ⋅157813.

It can be written as a sum of positive squares in 2 ways, for example, as 21687649 + 57304900 = 4657^2 + 7570^2 .

It is a cyclic number.

It is not a de Polignac number, because 78992549 - 2⁸ = 78992293 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78992549.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78992579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1361912 + ... + 1361969.

It is an arithmetic number, because the mean of its divisors is an integer number (20429115).

Almost surely, 2^78992549 is an apocalyptic number.

It is an amenable number.

78992549 is a deficient number, since it is larger than the sum of its proper divisors (2723911).

78992549 is a wasteful number, since it uses less digits than its factorization.

78992549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2723910.

The product of its digits is 1632960, while the sum is 53.

The square root of 78992549 is about 8887.7752559344. The cubic root of 78992549 is about 429.0705523831.

The spelling of 78992549 in words is "seventy-eight million, nine hundred ninety-two thousand, five hundred forty-nine".