78489263 has 4 divisors (see below), whose sum is σ = 78594528. Its totient is φ = 78384000.

The previous prime is 78489259. The next prime is 78489277. The reversal of 78489263 is 36298487.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78489263 - 2² = 78489259 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 (78489223) 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, 51506 + ... + 53007.

It is an arithmetic number, because the mean of its divisors is an integer number (19648632).

Almost surely, 2^78489263 is an apocalyptic number.

78489263 is a deficient number, since it is larger than the sum of its proper divisors (105265).

78489263 is a wasteful number, since it uses less digits than its factorization.

78489263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105264.

The product of its digits is 580608, while the sum is 47.

The square root of 78489263 is about 8859.4166286500. The cubic root of 78489263 is about 428.1573630889.

The spelling of 78489263 in words is "seventy-eight million, four hundred eighty-nine thousand, two hundred sixty-three".