77998267 has 4 divisors (see below), whose sum is σ = 81389520. Its totient is φ = 74607016.

The previous prime is 77998241. The next prime is 77998273. The reversal of 77998267 is 76289977.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 77998267 - 2¹⁵ = 77965499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77998867) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1695592 + ... + 1695637.

It is an arithmetic number, because the mean of its divisors is an integer number (20347380).

Almost surely, 2^77998267 is an apocalyptic number.

77998267 is a deficient number, since it is larger than the sum of its proper divisors (3391253).

77998267 is a wasteful number, since it uses less digits than its factorization.

77998267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3391252.

The product of its digits is 2667168, while the sum is 55.

The square root of 77998267 is about 8831.6627539779. The cubic root of 77998267 is about 427.2627038226.

The spelling of 77998267 in words is "seventy-seven million, nine hundred ninety-eight thousand, two hundred sixty-seven".