77268281 has 4 divisors (see below), whose sum is σ = 81813492. Its totient is φ = 72723072.

The previous prime is 77268277. The next prime is 77268283. The reversal of 77268281 is 18286277.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18286277 = 643 ⋅28439.

It can be written as a sum of positive squares in 2 ways, for example, as 67502656 + 9765625 = 8216^2 + 3125^2 .

It is a cyclic number.

It is not a de Polignac number, because 77268281 - 2² = 77268277 is a prime.

It is a super-2 number, since 2×77268281² = 11940774497389922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77268283) 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, 2272580 + ... + 2272613.

It is an arithmetic number, because the mean of its divisors is an integer number (20453373).

Almost surely, 2^77268281 is an apocalyptic number.

It is an amenable number.

77268281 is a deficient number, since it is larger than the sum of its proper divisors (4545211).

77268281 is a wasteful number, since it uses less digits than its factorization.

77268281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545210.

The product of its digits is 75264, while the sum is 41.

The square root of 77268281 is about 8790.2378238589. The cubic root of 77268281 is about 425.9256061911.

The spelling of 77268281 in words is "seventy-seven million, two hundred sixty-eight thousand, two hundred eighty-one".