27997990 has 16 divisors (see below), whose sum is σ = 50496048. Its totient is φ = 11177056.

The previous prime is 27997987. The next prime is 27997993. The reversal of 27997990 is 9979972.

It is an interprime number because it is at equal distance from previous prime (27997987) and next prime (27997993).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27997993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3144 + ... + 8116.

It is an arithmetic number, because the mean of its divisors is an integer number (3156003).

Almost surely, 2^27997990 is an apocalyptic number.

27997990 is a deficient number, since it is larger than the sum of its proper divisors (22498058).

27997990 is a wasteful number, since it uses less digits than its factorization.

27997990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5543.

The product of its (nonzero) digits is 642978, while the sum is 52.

The square root of 27997990 is about 5291.3126915729. The cubic root of 27997990 is about 303.6516308901.

The spelling of 27997990 in words is "twenty-seven million, nine hundred ninety-seven thousand, nine hundred ninety".