28311093 has 8 divisors (see below), whose sum is σ = 41942400. Its totient is φ = 18874044.

The previous prime is 28311053. The next prime is 28311113. The reversal of 28311093 is 39011382.

It is not a de Polignac number, because 28311093 - 2⁸ = 28310837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 1048559 = 28311093 / (2 + 8 + 3 + 1 + 1 + 0 + 9 + 3).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28311013) 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, 524253 + ... + 524306.

It is an arithmetic number, because the mean of its divisors is an integer number (5242800).

Almost surely, 2^28311093 is an apocalyptic number.

It is an amenable number.

28311093 is a deficient number, since it is larger than the sum of its proper divisors (13631307).

28311093 is a wasteful number, since it uses less digits than its factorization.

28311093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048568 (or 1048562 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 28311093 is about 5320.8169485522. The cubic root of 28311093 is about 304.7793548854.

The spelling of 28311093 in words is "twenty-eight million, three hundred eleven thousand, ninety-three".