78813451 has 4 divisors (see below), whose sum is σ = 78852600. Its totient is φ = 78774304.

The previous prime is 78813443. The next prime is 78813457. The reversal of 78813451 is 15431887.

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 78813451 - 2³ = 78813443 is a prime.

It is a super-3 number, since 3×78813451³ (a number of 25 digits) contains 333 as substring.

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 78813451.

It is not an unprimeable number, because it can be changed into a prime (78813457) 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, 16381 + ... + 20638.

It is an arithmetic number, because the mean of its divisors is an integer number (19713150).

Almost surely, 2^78813451 is an apocalyptic number.

78813451 is a deficient number, since it is larger than the sum of its proper divisors (39149).

78813451 is a wasteful number, since it uses less digits than its factorization.

78813451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39148.

The product of its digits is 26880, while the sum is 37.

The square root of 78813451 is about 8877.6940136502. The cubic root of 78813451 is about 428.7460330504.

The spelling of 78813451 in words is "seventy-eight million, eight hundred thirteen thousand, four hundred fifty-one".