27840428 has 72 divisors (see below), whose sum is σ = 63680400. Its totient is φ = 10523520.

The previous prime is 27840413. The next prime is 27840433. The reversal of 27840428 is 82404872.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 79598 + ... + 79946.

It is an arithmetic number, because the mean of its divisors is an integer number (884450).

Almost surely, 2^27840428 is an apocalyptic number.

27840428 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27840428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31840200).

27840428 is an abundant number, since it is smaller than the sum of its proper divisors (35839972).

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

27840428 is a wasteful number, since it uses less digits than its factorization.

27840428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 415 (or 406 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 35.

The square root of 27840428 is about 5276.4029413986. The cubic root of 27840428 is about 303.0809471958.

The spelling of 27840428 in words is "twenty-seven million, eight hundred forty thousand, four hundred twenty-eight".