27428220 has 60 divisors (see below), whose sum is σ = 86048424. Its totient is φ = 7313760.

The previous prime is 27428209. The next prime is 27428227. The reversal of 27428220 is 2282472.

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 (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27428227) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6846 + ... + 10085.

Almost surely, 2^27428220 is an apocalyptic number.

27428220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

27428220 is an abundant number, since it is smaller than the sum of its proper divisors (58620204).

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

27428220 is a wasteful number, since it uses less digits than its factorization.

27428220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16952 (or 16941 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 27.

The square root of 27428220 is about 5237.1958145557. The cubic root of 27428220 is about 301.5776884526.

The spelling of 27428220 in words is "twenty-seven million, four hundred twenty-eight thousand, two hundred twenty".