27921620 has 24 divisors (see below), whose sum is σ = 60000864. Its totient is φ = 10908576.

The previous prime is 27921617. The next prime is 27921623. The reversal of 27921620 is 2612972.

It is an interprime number because it is at equal distance from previous prime (27921617) and next prime (27921623).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27921623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15374 + ... + 17093.

It is an arithmetic number, because the mean of its divisors is an integer number (2500036).

Almost surely, 2^27921620 is an apocalyptic number.

27921620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27921620 is an abundant number, since it is smaller than the sum of its proper divisors (32079244).

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

27921620 is a wasteful number, since it uses less digits than its factorization.

27921620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32519 (or 32517 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 27921620 is about 5284.0912179863. The cubic root of 27921620 is about 303.3752897190.

The spelling of 27921620 in words is "twenty-seven million, nine hundred twenty-one thousand, six hundred twenty".