78486253 has 4 divisors (see below), whose sum is σ = 78700480. Its totient is φ = 78272028.

The previous prime is 78486251. The next prime is 78486257. The reversal of 78486253 is 35268487.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 78486253 - 2¹ = 78486251 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 (78486251) 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, 106563 + ... + 107296.

It is an arithmetic number, because the mean of its divisors is an integer number (19675120).

Almost surely, 2^78486253 is an apocalyptic number.

It is an amenable number.

78486253 is a deficient number, since it is larger than the sum of its proper divisors (214227).

78486253 is a wasteful number, since it uses less digits than its factorization.

78486253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 214226.

The product of its digits is 322560, while the sum is 43.

The square root of 78486253 is about 8859.2467512763. The cubic root of 78486253 is about 428.1518898556.

The spelling of 78486253 in words is "seventy-eight million, four hundred eighty-six thousand, two hundred fifty-three".