78273229 has 4 divisors (see below), whose sum is σ = 78303484. Its totient is φ = 78242976.

The previous prime is 78273211. The next prime is 78273259. The reversal of 78273229 is 92237287.

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 54361129 + 23912100 = 7373^2 + 4890^2 .

It is a cyclic number.

It is not a de Polignac number, because 78273229 - 2⁵ = 78273197 is a prime.

It is a super-2 number, since 2×78273229² = 12253396756172882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78273191 and 78273200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78273259) 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, 10842 + ... + 16555.

It is an arithmetic number, because the mean of its divisors is an integer number (19575871).

Almost surely, 2^78273229 is an apocalyptic number.

It is an amenable number.

78273229 is a deficient number, since it is larger than the sum of its proper divisors (30255).

78273229 is a wasteful number, since it uses less digits than its factorization.

78273229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30254.

The product of its digits is 84672, while the sum is 40.

The square root of 78273229 is about 8847.2158897588. The cubic root of 78273229 is about 427.7641817509.

The spelling of 78273229 in words is "seventy-eight million, two hundred seventy-three thousand, two hundred twenty-nine".