27991782290 has 16 divisors (see below), whose sum is σ = 50388963840. Its totient is φ = 11195878320.

The previous prime is 27991782263. The next prime is 27991782373. The reversal of 27991782290 is 9228719972.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46991 + ... + 241229.

It is an arithmetic number, because the mean of its divisors is an integer number (3149310240).

Almost surely, 2^27991782290 is an apocalyptic number.

27991782290 is a deficient number, since it is larger than the sum of its proper divisors (22397181550).

27991782290 is a wasteful number, since it uses less digits than its factorization.

27991782290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208657.

The product of its (nonzero) digits is 2286144, while the sum is 56.

The spelling of 27991782290 in words is "twenty-seven billion, nine hundred ninety-one million, seven hundred eighty-two thousand, two hundred ninety".