77820233 has 4 divisors (see below), whose sum is σ = 79139280. Its totient is φ = 76501188.

The previous prime is 77820221. The next prime is 77820241. The reversal of 77820233 is 33202877.

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 77820233 - 2²⁰ = 76771657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 77820233.

It is not an unprimeable number, because it can be changed into a prime (77820133) 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, 659435 + ... + 659552.

It is an arithmetic number, because the mean of its divisors is an integer number (19784820).

Almost surely, 2^77820233 is an apocalyptic number.

It is an amenable number.

77820233 is a deficient number, since it is larger than the sum of its proper divisors (1319047).

77820233 is a wasteful number, since it uses less digits than its factorization.

77820233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319046.

The product of its (nonzero) digits is 14112, while the sum is 32.

The square root of 77820233 is about 8821.5776933608. The cubic root of 77820233 is about 426.9373750680.

The spelling of 77820233 in words is "seventy-seven million, eight hundred twenty thousand, two hundred thirty-three".