27997877 has 4 divisors (see below), whose sum is σ = 29215200. Its totient is φ = 26780556.

The previous prime is 27997829. The next prime is 27997883. The reversal of 27997877 is 77879972.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-27997877 is a prime.

It is a super-2 number, since 2×27997877² = 1567762233014258, 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 (27997807) 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, 608627 + ... + 608672.

It is an arithmetic number, because the mean of its divisors is an integer number (7303800).

Almost surely, 2^27997877 is an apocalyptic number.

It is an amenable number.

27997877 is a deficient number, since it is larger than the sum of its proper divisors (1217323).

27997877 is a wasteful number, since it uses less digits than its factorization.

27997877 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1217322.

The product of its digits is 3111696, while the sum is 56.

The square root of 27997877 is about 5291.3020136825. The cubic root of 27997877 is about 303.6512223765.

The spelling of 27997877 in words is "twenty-seven million, nine hundred ninety-seven thousand, eight hundred seventy-seven".