28155361 has 8 divisors (see below), whose sum is σ = 30386664. Its totient is φ = 25933440.

The previous prime is 28155341. The next prime is 28155367. The reversal of 28155361 is 16355182.

It can be written as a sum of positive squares in 4 ways, for example, as 118336 + 28037025 = 344^2 + 5295^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28155361 - 2⁵ = 28155329 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28155367) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4695 + ... + 8851.

It is an arithmetic number, because the mean of its divisors is an integer number (3798333).

Almost surely, 2^28155361 is an apocalyptic number.

It is an amenable number.

28155361 is a deficient number, since it is larger than the sum of its proper divisors (2231303).

28155361 is a wasteful number, since it uses less digits than its factorization.

28155361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4691.

The product of its digits is 7200, while the sum is 31.

The square root of 28155361 is about 5306.1625493383. The cubic root of 28155361 is about 304.2194896021.

The spelling of 28155361 in words is "twenty-eight million, one hundred fifty-five thousand, three hundred sixty-one".