78193453 has 4 divisors (see below), whose sum is σ = 84208348. Its totient is φ = 72178560.

The previous prime is 78193447. The next prime is 78193457. The reversal of 78193453 is 35439187.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 35439187 = 7 ⋅5062741.

It can be written as a sum of positive squares in 2 ways, for example, as 39778249 + 38415204 = 6307^2 + 6198^2 .

It is a cyclic number.

It is not a de Polignac number, because 78193453 - 2¹⁷ = 78062381 is a prime.

It is a super-2 number, since 2×78193453² = 12228432184126418, which contains 22 as substring.

It is a Duffinian number.

It is a zygodrome in base 12.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78193457) 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, 3007428 + ... + 3007453.

It is an arithmetic number, because the mean of its divisors is an integer number (21052087).

Almost surely, 2^78193453 is an apocalyptic number.

It is an amenable number.

78193453 is a deficient number, since it is larger than the sum of its proper divisors (6014895).

78193453 is a wasteful number, since it uses less digits than its factorization.

78193453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6014894.

The product of its digits is 90720, while the sum is 40.

The square root of 78193453 is about 8842.7062034199. The cubic root of 78193453 is about 427.6188067363.

The spelling of 78193453 in words is "seventy-eight million, one hundred ninety-three thousand, four hundred fifty-three".