27391890 has 16 divisors (see below), whose sum is σ = 65740608. Its totient is φ = 7304496.

The previous prime is 27391849. The next prime is 27391933. The reversal of 27391890 is 9819372.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 456502 + ... + 456561.

It is an arithmetic number, because the mean of its divisors is an integer number (4108788).

Almost surely, 2^27391890 is an apocalyptic number.

27391890 is an abundant number, since it is smaller than the sum of its proper divisors (38348718).

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

27391890 is a wasteful number, since it uses less digits than its factorization.

27391890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 913073.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 27391890 is about 5233.7262060601. The cubic root of 27391890 is about 301.4444782239. Note that the first 4 decimals are identical.

The spelling of 27391890 in words is "twenty-seven million, three hundred ninety-one thousand, eight hundred ninety".