78958249 has 4 divisors (see below), whose sum is σ = 78978564. Its totient is φ = 78937936.

The previous prime is 78958237. The next prime is 78958273. The reversal of 78958249 is 94285987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 94285987 = 6581 ⋅14327.

It can be written as a sum of positive squares in 2 ways, for example, as 31002624 + 47955625 = 5568^2 + 6925^2 .

It is a cyclic number.

It is not a de Polignac number, because 78958249 - 2¹⁵ = 78925481 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78958196 and 78958205.

It is not an unprimeable number, because it can be changed into a prime (78958349) 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, 2302 + ... + 12775.

It is an arithmetic number, because the mean of its divisors is an integer number (19744641).

Almost surely, 2^78958249 is an apocalyptic number.

It is an amenable number.

78958249 is a deficient number, since it is larger than the sum of its proper divisors (20315).

78958249 is a wasteful number, since it uses less digits than its factorization.

78958249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20314.

The product of its digits is 1451520, while the sum is 52.

The square root of 78958249 is about 8885.8454296707. The cubic root of 78958249 is about 429.0084399823.

The spelling of 78958249 in words is "seventy-eight million, nine hundred fifty-eight thousand, two hundred forty-nine".