78856949 has 4 divisors (see below), whose sum is σ = 82285536. Its totient is φ = 75428364.

The previous prime is 78856871. The next prime is 78856979. The reversal of 78856949 is 94965887.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78856949 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78856894 and 78856903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78856979) 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, 1714259 + ... + 1714304.

It is an arithmetic number, because the mean of its divisors is an integer number (20571384).

Almost surely, 2^78856949 is an apocalyptic number.

It is an amenable number.

78856949 is a deficient number, since it is larger than the sum of its proper divisors (3428587).

78856949 is a wasteful number, since it uses less digits than its factorization.

78856949 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3428586.

The product of its digits is 4354560, while the sum is 56.

The square root of 78856949 is about 8880.1435236149. The cubic root of 78856949 is about 428.8248950754.

The spelling of 78856949 in words is "seventy-eight million, eight hundred fifty-six thousand, nine hundred forty-nine".