28055331 has 12 divisors (see below), whose sum is σ = 42286608. Its totient is φ = 17890224.

The previous prime is 28055327. The next prime is 28055333. The reversal of 28055331 is 13355082.

28055331 is a `hidden beast` number, since 2 + 80 + 553 + 31 = 666.

It is not a de Polignac number, because 28055331 - 2² = 28055327 is a prime.

It is a super-2 number, since 2×28055331² = 1574203195039122, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28055295 and 28055304.

It is not an unprimeable number, because it can be changed into a prime (28055333) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 67560 + ... + 67973.

It is an arithmetic number, because the mean of its divisors is an integer number (3523884).

Almost surely, 2^28055331 is an apocalyptic number.

28055331 is a deficient number, since it is larger than the sum of its proper divisors (14231277).

28055331 is a wasteful number, since it uses less digits than its factorization.

28055331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135562 (or 135559 counting only the distinct ones).

The product of its (nonzero) digits is 3600, while the sum is 27.

The square root of 28055331 is about 5296.7283298278. The cubic root of 28055331 is about 303.8587864164.

It can be divided in two parts, 280 and 55331, that added together give a triangular number (55611 = T₃₃₃).

The spelling of 28055331 in words is "twenty-eight million, fifty-five thousand, three hundred thirty-one".