76991273 has 4 divisors (see below), whose sum is σ = 77118720. Its totient is φ = 76863828.

The previous prime is 76991263. The next prime is 76991279. The reversal of 76991273 is 37219967.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 76991273 - 2⁸ = 76991017 is a prime.

It is a super-3 number, since 3×76991273³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (76991279) 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, 62813 + ... + 64026.

It is an arithmetic number, because the mean of its divisors is an integer number (19279680).

Almost surely, 2^76991273 is an apocalyptic number.

It is an amenable number.

76991273 is a deficient number, since it is larger than the sum of its proper divisors (127447).

76991273 is a wasteful number, since it uses less digits than its factorization.

76991273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127446.

The product of its digits is 142884, while the sum is 44.

The square root of 76991273 is about 8774.4671063262. The cubic root of 76991273 is about 425.4160134115.

The spelling of 76991273 in words is "seventy-six million, nine hundred ninety-one thousand, two hundred seventy-three".