78544453 has 4 divisors (see below), whose sum is σ = 84586348. Its totient is φ = 72502560.

The previous prime is 78544447. The next prime is 78544469. The reversal of 78544453 is 35444587.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 12236004 + 66308449 = 3498^2 + 8143^2 .

It is a de Polignac number, because none of the positive numbers 2^k-78544453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78544493) 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, 3020928 + ... + 3020953.

It is an arithmetic number, because the mean of its divisors is an integer number (21146587).

Almost surely, 2^78544453 is an apocalyptic number.

It is an amenable number.

78544453 is a deficient number, since it is larger than the sum of its proper divisors (6041895).

78544453 is a wasteful number, since it uses less digits than its factorization.

78544453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6041894.

The product of its digits is 268800, while the sum is 40.

The square root of 78544453 is about 8862.5308462087. The cubic root of 78544453 is about 428.2576930263.

The spelling of 78544453 in words is "seventy-eight million, five hundred forty-four thousand, four hundred fifty-three".