78566253 has 8 divisors (see below), whose sum is σ = 105154368. Its totient is φ = 52177824.

The previous prime is 78566251. The next prime is 78566261. The reversal of 78566253 is 35266587.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 78566253 - 2¹ = 78566251 is a prime.

It is a super-2 number, since 2×78566253² = 12345312220920018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78566251) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49000 + ... + 50577.

It is an arithmetic number, because the mean of its divisors is an integer number (13144296).

Almost surely, 2^78566253 is an apocalyptic number.

It is an amenable number.

78566253 is a deficient number, since it is larger than the sum of its proper divisors (26588115).

78566253 is a wasteful number, since it uses less digits than its factorization.

78566253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 99843.

The product of its digits is 302400, while the sum is 42.

The square root of 78566253 is about 8863.7606578698. The cubic root of 78566253 is about 428.2973103120.

The spelling of 78566253 in words is "seventy-eight million, five hundred sixty-six thousand, two hundred fifty-three".