78961247 has 4 divisors (see below), whose sum is σ = 81508416. Its totient is φ = 76414080.

The previous prime is 78961241. The next prime is 78961249. The reversal of 78961247 is 74216987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74216987 = 13 ⋅5708999.

It is a cyclic number.

It is not a de Polignac number, because 78961247 - 2⁸ = 78960991 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78961198 and 78961207.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78961241) 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, 1273538 + ... + 1273599.

It is an arithmetic number, because the mean of its divisors is an integer number (20377104).

Almost surely, 2^78961247 is an apocalyptic number.

78961247 is a deficient number, since it is larger than the sum of its proper divisors (2547169).

78961247 is a wasteful number, since it uses less digits than its factorization.

78961247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547168.

The product of its digits is 169344, while the sum is 44.

The square root of 78961247 is about 8886.0141233289. The cubic root of 78961247 is about 429.0138696494.

The spelling of 78961247 in words is "seventy-eight million, nine hundred sixty-one thousand, two hundred forty-seven".