78776273 has 4 divisors (see below), whose sum is σ = 79045428. Its totient is φ = 78507120.

The previous prime is 78776251. The next prime is 78776279. The reversal of 78776273 is 37267787.

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 57032704 + 21743569 = 7552^2 + 4663^2 .

It is a cyclic number.

It is not a de Polignac number, because 78776273 - 2²⁰ = 77727697 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78776279) 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, 134138 + ... + 134723.

It is an arithmetic number, because the mean of its divisors is an integer number (19761357).

Almost surely, 2^78776273 is an apocalyptic number.

It is an amenable number.

78776273 is a deficient number, since it is larger than the sum of its proper divisors (269155).

78776273 is a wasteful number, since it uses less digits than its factorization.

78776273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269154.

The product of its digits is 691488, while the sum is 47.

The square root of 78776273 is about 8875.5998670512. The cubic root of 78776273 is about 428.6786062052.

The spelling of 78776273 in words is "seventy-eight million, seven hundred seventy-six thousand, two hundred seventy-three".