27097728 has 128 divisors (see below), whose sum is σ = 87246720. Its totient is φ = 7274496.

The previous prime is 27097699. The next prime is 27097769. The reversal of 27097728 is 82779072.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 27097728.

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, 45400 + ... + 45992.

It is an arithmetic number, because the mean of its divisors is an integer number (681615).

Almost surely, 2^27097728 is an apocalyptic number.

27097728 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 27097728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43623360).

27097728 is an abundant number, since it is smaller than the sum of its proper divisors (60148992).

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

27097728 is a wasteful number, since it uses less digits than its factorization.

27097728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 622 counting only the distinct ones).

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 27097728 is about 5205.5478097891. The cubic root of 27097728 is about 300.3615197255.

The spelling of 27097728 in words is "twenty-seven million, ninety-seven thousand, seven hundred twenty-eight".