78143453 has 4 divisors (see below), whose sum is σ = 78641340. Its totient is φ = 77645568.

The previous prime is 78143449. The next prime is 78143477. The reversal of 78143453 is 35434187.

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 10936249 + 67207204 = 3307^2 + 8198^2 .

It is a cyclic number.

It is not a de Polignac number, because 78143453 - 2² = 78143449 is a prime.

It is a super-2 number, since 2×78143453² = 12212798493526418, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78143423) 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, 248708 + ... + 249021.

It is an arithmetic number, because the mean of its divisors is an integer number (19660335).

Almost surely, 2^78143453 is an apocalyptic number.

It is an amenable number.

78143453 is a deficient number, since it is larger than the sum of its proper divisors (497887).

78143453 is a wasteful number, since it uses less digits than its factorization.

78143453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 497886.

The product of its digits is 40320, while the sum is 35.

The square root of 78143453 is about 8839.8785625143. The cubic root of 78143453 is about 427.5276418181.

The spelling of 78143453 in words is "seventy-eight million, one hundred forty-three thousand, four hundred fifty-three".