78453451 has 4 divisors (see below), whose sum is σ = 82582600. Its totient is φ = 74324304.

The previous prime is 78453443. The next prime is 78453469. The reversal of 78453451 is 15435487.

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 78453451 - 2³ = 78453443 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78453451.

It is not an unprimeable number, because it can be changed into a prime (78453491) 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, 2064546 + ... + 2064583.

It is an arithmetic number, because the mean of its divisors is an integer number (20645650).

Almost surely, 2^78453451 is an apocalyptic number.

78453451 is a deficient number, since it is larger than the sum of its proper divisors (4129149).

78453451 is a wasteful number, since it uses less digits than its factorization.

78453451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4129148.

The product of its digits is 67200, while the sum is 37.

The square root of 78453451 is about 8857.3952717489. The cubic root of 78453451 is about 428.0922352676.

The spelling of 78453451 in words is "seventy-eight million, four hundred fifty-three thousand, four hundred fifty-one".