77204091 has 4 divisors (see below), whose sum is σ = 102938792. Its totient is φ = 51469392.

The previous prime is 77204081. The next prime is 77204137. The reversal of 77204091 is 19040277.

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

It is not a de Polignac number, because 77204091 - 2¹⁵ = 77171323 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (77204041) 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, 12867346 + ... + 12867351.

It is an arithmetic number, because the mean of its divisors is an integer number (25734698).

Almost surely, 2^77204091 is an apocalyptic number.

77204091 is a deficient number, since it is larger than the sum of its proper divisors (25734701).

77204091 is a wasteful number, since it uses less digits than its factorization.

77204091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25734700.

The product of its (nonzero) digits is 3528, while the sum is 30.

The square root of 77204091 is about 8786.5858557235. The cubic root of 77204091 is about 425.8076287637.

It can be divided in two parts, 7720 and 4091, that added together give a palindrome (11811).

The spelling of 77204091 in words is "seventy-seven million, two hundred four thousand, ninety-one".