78722269 has 8 divisors (see below), whose sum is σ = 82773720. Its totient is φ = 74760000.

The previous prime is 78722249. The next prime is 78722279. The reversal of 78722269 is 96222787.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1932100 + 76790169 = 1390^2 + 8763^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 78722269 - 2⁷ = 78722141 is a prime.

It is a super-2 number, since 2×78722269² = 12394391273016722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78722249) 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, 20482 + ... + 24019.

It is an arithmetic number, because the mean of its divisors is an integer number (10346715).

Almost surely, 2^78722269 is an apocalyptic number.

It is an amenable number.

78722269 is a deficient number, since it is larger than the sum of its proper divisors (4051451).

78722269 is a wasteful number, since it uses less digits than its factorization.

78722269 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44591.

The product of its digits is 169344, while the sum is 43.

The square root of 78722269 is about 8872.5570722312. The cubic root of 78722269 is about 428.5806255540.

The spelling of 78722269 in words is "seventy-eight million, seven hundred twenty-two thousand, two hundred sixty-nine".