77991133 has 8 divisors (see below), whose sum is σ = 87826176. Its totient is φ = 68613600.

The previous prime is 77991119. The next prime is 77991139. The reversal of 77991133 is 33119977.

It is a happy number.

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

It is not a de Polignac number, because 77991133 - 2⁹ = 77990621 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77991139) by changing a digit.

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

It is an upside-down number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114016 + ... + 114697.

It is an arithmetic number, because the mean of its divisors is an integer number (10978272).

Almost surely, 2^77991133 is an apocalyptic number.

It is an amenable number.

77991133 is a deficient number, since it is larger than the sum of its proper divisors (9835043).

77991133 is a wasteful number, since it uses less digits than its factorization.

77991133 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 228755.

The product of its digits is 35721, while the sum is 40.

The square root of 77991133 is about 8831.2588570373. The cubic root of 77991133 is about 427.2496771013.

The spelling of 77991133 in words is "seventy-seven million, nine hundred ninety-one thousand, one hundred thirty-three".