78934451 has 4 divisors (see below), whose sum is σ = 83577672. Its totient is φ = 74291232.

The previous prime is 78934447. The next prime is 78934481. The reversal of 78934451 is 15443987.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 15443987 = 13 ⋅1187999.

It is a cyclic number.

It is not a de Polignac number, because 78934451 - 2² = 78934447 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78934399 and 78934408.

It is not an unprimeable number, because it can be changed into a prime (78934481) 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, 2321585 + ... + 2321618.

It is an arithmetic number, because the mean of its divisors is an integer number (20894418).

Almost surely, 2^78934451 is an apocalyptic number.

78934451 is a deficient number, since it is larger than the sum of its proper divisors (4643221).

78934451 is a wasteful number, since it uses less digits than its factorization.

78934451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4643220.

The product of its digits is 120960, while the sum is 41.

The square root of 78934451 is about 8884.5062327627. The cubic root of 78934451 is about 428.9653346328.

The spelling of 78934451 in words is "seventy-eight million, nine hundred thirty-four thousand, four hundred fifty-one".