27897840 has 60 divisors (see below), whose sum is σ = 93692664. Its totient is φ = 7439232.

The previous prime is 27897839. The next prime is 27897887. The reversal of 27897840 is 4879872.

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

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, 18654 + ... + 20093.

Almost surely, 2^27897840 is an apocalyptic number.

27897840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27897840 is an abundant number, since it is smaller than the sum of its proper divisors (65794824).

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

27897840 is a wasteful number, since it uses less digits than its factorization.

27897840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38766 (or 38757 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 27897840 is about 5281.8405882798. The cubic root of 27897840 is about 303.2891400684.

The spelling of 27897840 in words is "twenty-seven million, eight hundred ninety-seven thousand, eight hundred forty".