78916651 has 4 divisors (see below), whose sum is σ = 86090904. Its totient is φ = 71742400.

The previous prime is 78916639. The next prime is 78916661. The reversal of 78916651 is 15661987.

It is a happy number.

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 78916651 - 2¹⁷ = 78785579 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78916598 and 78916607.

It is not an unprimeable number, because it can be changed into a prime (78916631) 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, 3587110 + ... + 3587131.

It is an arithmetic number, because the mean of its divisors is an integer number (21522726).

Almost surely, 2^78916651 is an apocalyptic number.

78916651 is a deficient number, since it is larger than the sum of its proper divisors (7174253).

78916651 is a wasteful number, since it uses less digits than its factorization.

78916651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7174252.

The product of its digits is 90720, while the sum is 43.

The square root of 78916651 is about 8883.5044323735. The cubic root of 78916651 is about 428.9330878049.

It can be divided in two parts, 78916 and 651, that multiplied together give a triangular number (51374316 = T₁₀₁₃₆).

The spelling of 78916651 in words is "seventy-eight million, nine hundred sixteen thousand, six hundred fifty-one".