78273261 has 24 divisors (see below), whose sum is σ = 123689280. Its totient is φ = 47304000.

The previous prime is 78273259. The next prime is 78273313. The reversal of 78273261 is 16237287.

It is not a de Polignac number, because 78273261 - 2¹ = 78273259 is a prime.

It is a super-2 number, since 2×78273261² = 12253406775148242, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78273211) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42561 + ... + 44361.

It is an arithmetic number, because the mean of its divisors is an integer number (5153720).

Almost surely, 2^78273261 is an apocalyptic number.

It is an amenable number.

78273261 is a deficient number, since it is larger than the sum of its proper divisors (45416019).

78273261 is a wasteful number, since it uses less digits than its factorization.

78273261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2257 (or 2254 counting only the distinct ones).

The product of its digits is 28224, while the sum is 36.

The square root of 78273261 is about 8847.2176982371. The cubic root of 78273261 is about 427.7642400443.

The spelling of 78273261 in words is "seventy-eight million, two hundred seventy-three thousand, two hundred sixty-one".