27821916 has 36 divisors (see below), whose sum is σ = 70702632. Its totient is φ = 9224544.

The previous prime is 27821887. The next prime is 27821929. The reversal of 27821916 is 61912872.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×27821916² = 1548118019822112, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 5131 + ... + 9053.

It is an arithmetic number, because the mean of its divisors is an integer number (1963962).

Almost surely, 2^27821916 is an apocalyptic number.

It is an amenable number.

27821916 is an abundant number, since it is smaller than the sum of its proper divisors (42880716).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

27821916 is a wasteful number, since it uses less digits than its factorization.

27821916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4130 (or 4125 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 27821916 is about 5274.6484243028. The cubic root of 27821916 is about 303.0137561967.

The spelling of 27821916 in words is "twenty-seven million, eight hundred twenty-one thousand, nine hundred sixteen".