291080428 has 24 divisors (see below), whose sum is σ = 521002944. Its totient is φ = 142256400.

The previous prime is 291080423. The next prime is 291080441. The reversal of 291080428 is 824080192.

It is a junction number, because it is equal to n+sod(n) for n = 291080393 and 291080402.

It is not an unprimeable number, because it can be changed into a prime (291080423) 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 7 ways as a sum of consecutive naturals, for example, 30963 + ... + 39253.

It is an arithmetic number, because the mean of its divisors is an integer number (21708456).

Almost surely, 2^291080428 is an apocalyptic number.

It is an amenable number.

291080428 is a deficient number, since it is larger than the sum of its proper divisors (229922516).

291080428 is a wasteful number, since it uses less digits than its factorization.

291080428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8493 (or 8491 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 34.

The square root of 291080428 is about 17061.0793327972. The cubic root of 291080428 is about 662.7315838297.

It can be divided in two parts, 2910 and 80428, that added together give a palindrome (83338).

The spelling of 291080428 in words is "two hundred ninety-one million, eighty thousand, four hundred twenty-eight".