27821990 has 32 divisors (see below), whose sum is σ = 57507840. Its totient is φ = 9493344.

The previous prime is 27821987. The next prime is 27821993. The reversal of 27821990 is 9912872.

It is an interprime number because it is at equal distance from previous prime (27821987) and next prime (27821993).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27821993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15899 + ... + 17561.

It is an arithmetic number, because the mean of its divisors is an integer number (1797120).

Almost surely, 2^27821990 is an apocalyptic number.

27821990 is an abundant number, since it is smaller than the sum of its proper divisors (29685850).

27821990 is a wasteful number, since it uses less digits than its factorization.

27821990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 27821990 is about 5274.6554389837. The cubic root of 27821990 is about 303.0140248458.

The spelling of 27821990 in words is "twenty-seven million, eight hundred twenty-one thousand, nine hundred ninety".