78816651 has 8 divisors (see below), whose sum is σ = 105261120. Its totient is φ = 52458312.

The previous prime is 78816649. The next prime is 78816659. The reversal of 78816651 is 15661887.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78816651 - 2¹ = 78816649 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78816659) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19365 + ... + 23078.

It is an arithmetic number, because the mean of its divisors is an integer number (13157640).

Almost surely, 2^78816651 is an apocalyptic number.

78816651 is a deficient number, since it is larger than the sum of its proper divisors (26444469).

78816651 is a wasteful number, since it uses less digits than its factorization.

78816651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43065.

The product of its digits is 80640, while the sum is 42.

The square root of 78816651 is about 8877.8742388029. The cubic root of 78816651 is about 428.7518356502.

The spelling of 78816651 in words is "seventy-eight million, eight hundred sixteen thousand, six hundred fifty-one".