78544253 has 4 divisors (see below), whose sum is σ = 78777660. Its totient is φ = 78310848.

The previous prime is 78544237. The next prime is 78544259. The reversal of 78544253 is 35244587.

It is a happy number.

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 18992164 + 59552089 = 4358^2 + 7717^2 .

It is a cyclic number.

It is not a de Polignac number, because 78544253 - 2⁴ = 78544237 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 (78544259) 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, 116198 + ... + 116871.

It is an arithmetic number, because the mean of its divisors is an integer number (19694415).

Almost surely, 2^78544253 is an apocalyptic number.

It is an amenable number.

78544253 is a deficient number, since it is larger than the sum of its proper divisors (233407).

78544253 is a wasteful number, since it uses less digits than its factorization.

78544253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233406.

The product of its digits is 134400, while the sum is 38.

The square root of 78544253 is about 8862.5195627429. The cubic root of 78544253 is about 428.2573295310.

The spelling of 78544253 in words is "seventy-eight million, five hundred forty-four thousand, two hundred fifty-three".