28161441 has 24 divisors (see below), whose sum is σ = 50716224. Its totient is φ = 14628960.

The previous prime is 28161421. The next prime is 28161473. The reversal of 28161441 is 14416182.

It is a happy number.

28161441 is a `hidden beast` number, since 2 + 8 + 1 + 614 + 41 = 666.

It is not a de Polignac number, because 28161441 - 2⁷ = 28161313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28161421) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19626 + ... + 21011.

It is an arithmetic number, because the mean of its divisors is an integer number (2113176).

Almost surely, 2^28161441 is an apocalyptic number.

28161441 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28161441 is a deficient number, since it is larger than the sum of its proper divisors (22554783).

28161441 is a wasteful number, since it uses less digits than its factorization.

28161441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40661 (or 40658 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 28161441 is about 5306.7354371591. The cubic root of 28161441 is about 304.2413862179.

The spelling of 28161441 in words is "twenty-eight million, one hundred sixty-one thousand, four hundred forty-one".