27861890 has 32 divisors (see below), whose sum is σ = 58492800. Its totient is φ = 9551472.

The previous prime is 27861877. The next prime is 27861931. The reversal of 27861890 is 9816872.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 632 + ... + 7491.

It is an arithmetic number, because the mean of its divisors is an integer number (1827900).

Almost surely, 2^27861890 is an apocalyptic number.

27861890 is an abundant number, since it is smaller than the sum of its proper divisors (30630910).

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

27861890 is an equidigital number, since it uses as much as digits as its factorization.

27861890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8151 (or 8137 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 27861890 is about 5278.4363214876. The cubic root of 27861890 is about 303.1588082177.

The spelling of 27861890 in words is "twenty-seven million, eight hundred sixty-one thousand, eight hundred ninety".