27145428 has 48 divisors (see below), whose sum is σ = 67253760. Its totient is φ = 8503264.

The previous prime is 27145423. The next prime is 27145477. The reversal of 27145428 is 82454172.

It is a super-2 number, since 2×27145428² = 1473748522606368, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (27145423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15451 + ... + 17117.

It is an arithmetic number, because the mean of its divisors is an integer number (1401120).

Almost surely, 2^27145428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 27145428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33626880).

27145428 is an abundant number, since it is smaller than the sum of its proper divisors (40108332).

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

27145428 is a wasteful number, since it uses less digits than its factorization.

27145428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756 (or 1754 counting only the distinct ones).

The product of its digits is 17920, while the sum is 33.

The square root of 27145428 is about 5210.1274456581. The cubic root of 27145428 is about 300.5376580593.

The spelling of 27145428 in words is "twenty-seven million, one hundred forty-five thousand, four hundred twenty-eight".