27998623 has 4 divisors (see below), whose sum is σ = 28019520. Its totient is φ = 27977728.

The previous prime is 27998617. The next prime is 27998651. The reversal of 27998623 is 32689972.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 27998623 - 2⁵ = 27998591 is a prime.

It is a super-2 number, since 2×27998623² = 1567845779792258, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27998023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8290 + ... + 11167.

It is an arithmetic number, because the mean of its divisors is an integer number (7004880).

Almost surely, 2^27998623 is an apocalyptic number.

27998623 is a deficient number, since it is larger than the sum of its proper divisors (20897).

27998623 is a wasteful number, since it uses less digits than its factorization.

27998623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20896.

The product of its digits is 326592, while the sum is 46.

The square root of 27998623 is about 5291.3725062596. The cubic root of 27998623 is about 303.6539192690.

The spelling of 27998623 in words is "twenty-seven million, nine hundred ninety-eight thousand, six hundred twenty-three".