77823091 has 4 divisors (see below), whose sum is σ = 78166152. Its totient is φ = 77480032.

The previous prime is 77823089. The next prime is 77823103. The reversal of 77823091 is 19032877.

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 77823091 - 2¹ = 77823089 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 77823091.

It is not an unprimeable number, because it can be changed into a prime (77823001) 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, 171190 + ... + 171643.

It is an arithmetic number, because the mean of its divisors is an integer number (19541538).

Almost surely, 2^77823091 is an apocalyptic number.

77823091 is a deficient number, since it is larger than the sum of its proper divisors (343061).

77823091 is a wasteful number, since it uses less digits than its factorization.

77823091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343060.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 77823091 is about 8821.7396810380. The cubic root of 77823091 is about 426.9426015240.

The spelling of 77823091 in words is "seventy-seven million, eight hundred twenty-three thousand, ninety-one".