78886651 has 4 divisors (see below), whose sum is σ = 83038600. Its totient is φ = 74734704.

The previous prime is 78886649. The next prime is 78886657. The reversal of 78886651 is 15668887.

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

It is a cyclic number.

It is not a de Polignac number, because 78886651 - 2¹ = 78886649 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78886595 and 78886604.

It is not an unprimeable number, because it can be changed into a prime (78886657) 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, 2075946 + ... + 2075983.

It is an arithmetic number, because the mean of its divisors is an integer number (20759650).

Almost surely, 2^78886651 is an apocalyptic number.

78886651 is a deficient number, since it is larger than the sum of its proper divisors (4151949).

78886651 is a wasteful number, since it uses less digits than its factorization.

78886651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151948.

The product of its digits is 645120, while the sum is 49.

The square root of 78886651 is about 8881.8157490459. The cubic root of 78886651 is about 428.8787282437.

The spelling of 78886651 in words is "seventy-eight million, eight hundred eighty-six thousand, six hundred fifty-one".