78844451 has 4 divisors (see below), whose sum is σ = 90107952. Its totient is φ = 67580952.

The previous prime is 78844429. The next prime is 78844489. The reversal of 78844451 is 15444887.

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 78844451 - 2²⁶ = 11735587 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78844399 and 78844408.

It is not an unprimeable number, because it can be changed into a prime (78844411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5631740 + ... + 5631753.

It is an arithmetic number, because the mean of its divisors is an integer number (22526988).

Almost surely, 2^78844451 is an apocalyptic number.

78844451 is a deficient number, since it is larger than the sum of its proper divisors (11263501).

78844451 is a wasteful number, since it uses less digits than its factorization.

78844451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11263500.

The product of its digits is 143360, while the sum is 41.

The square root of 78844451 is about 8879.4397908877. The cubic root of 78844451 is about 428.8022391278.

The spelling of 78844451 in words is "seventy-eight million, eight hundred forty-four thousand, four hundred fifty-one".