78816451 has 12 divisors (see below), whose sum is σ = 92108352. Its totient is φ = 67244688.

The previous prime is 78816449. The next prime is 78816467. The reversal of 78816451 is 15461887.

It is not a de Polignac number, because 78816451 - 2¹ = 78816449 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78816431) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7321 + ... + 14533.

It is an arithmetic number, because the mean of its divisors is an integer number (7675696).

Almost surely, 2^78816451 is an apocalyptic number.

78816451 is a deficient number, since it is larger than the sum of its proper divisors (13291901).

78816451 is a wasteful number, since it uses less digits than its factorization.

78816451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7450 (or 7443 counting only the distinct ones).

The product of its digits is 53760, while the sum is 40.

The square root of 78816451 is about 8877.8629748380. The cubic root of 78816451 is about 428.7514729923.

The spelling of 78816451 in words is "seventy-eight million, eight hundred sixteen thousand, four hundred fifty-one".