78684273 has 12 divisors (see below), whose sum is σ = 114662340. Its totient is φ = 51991296.

The previous prime is 78684257. The next prime is 78684299. The reversal of 78684273 is 37248687.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 944784 + 77739489 = 972^2 + 8817^2 .

It is not a de Polignac number, because 78684273 - 2⁴ = 78684257 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78684253) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 37668 + ... + 39701.

It is an arithmetic number, because the mean of its divisors is an integer number (9555195).

Almost surely, 2^78684273 is an apocalyptic number.

It is an amenable number.

78684273 is a deficient number, since it is larger than the sum of its proper divisors (35978067).

78684273 is a wasteful number, since it uses less digits than its factorization.

78684273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77488 (or 77485 counting only the distinct ones).

The product of its digits is 451584, while the sum is 45.

The square root of 78684273 is about 8870.4156046941. The cubic root of 78684273 is about 428.5116617132.

The spelling of 78684273 in words is "seventy-eight million, six hundred eighty-four thousand, two hundred seventy-three".