27991850 has 24 divisors (see below), whose sum is σ = 52784940. Its totient is φ = 11041920.

The previous prime is 27991819. The next prime is 27991867. The reversal of 27991850 is 5819972.

It can be written as a sum of positive squares in 6 ways, for example, as 18671041 + 9320809 = 4321^2 + 3053^2 .

It is a junction number, because it is equal to n+sod(n) for n = 27991798 and 27991807.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 185 + ... + 7484.

Almost surely, 2^27991850 is an apocalyptic number.

27991850 is a deficient number, since it is larger than the sum of its proper divisors (24793090).

27991850 is a wasteful number, since it uses less digits than its factorization.

27991850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7754 (or 7749 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 41.

The square root of 27991850 is about 5290.7324634686. The cubic root of 27991850 is about 303.6294321856.

It can be divided in two parts, 279 and 91850, that added together give a palindrome (92129).

The spelling of 27991850 in words is "twenty-seven million, nine hundred ninety-one thousand, eight hundred fifty".