27971990 has 16 divisors (see below), whose sum is σ = 52999920. Its totient is φ = 10599840.

The previous prime is 27971989. The next prime is 27972023. The reversal of 27971990 is 9917972.

It is a congruent number.

It is an unprimeable number.

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, 73421 + ... + 73800.

It is an arithmetic number, because the mean of its divisors is an integer number (3312495).

Almost surely, 2^27971990 is an apocalyptic number.

27971990 is a deficient number, since it is larger than the sum of its proper divisors (25027930).

27971990 is a wasteful number, since it uses less digits than its factorization.

27971990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 147247.

The product of its (nonzero) digits is 71442, while the sum is 44.

The square root of 27971990 is about 5288.8552636653. The cubic root of 27971990 is about 303.5576076225.

The spelling of 27971990 in words is "twenty-seven million, nine hundred seventy-one thousand, nine hundred ninety".