28537893 has 8 divisors (see below), whose sum is σ = 42278400. Its totient is φ = 19025244.

The previous prime is 28537879. The next prime is 28537909. The reversal of 28537893 is 39873582.

28537893 is a `hidden beast` number, since 28 + 537 + 8 + 93 = 666.

It is not a de Polignac number, because 28537893 - 2¹⁶ = 28472357 is a prime.

It is a super-2 number, since 2×28537893² = 1628822673758898, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28537823) 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 7 ways as a sum of consecutive naturals, for example, 528453 + ... + 528506.

It is an arithmetic number, because the mean of its divisors is an integer number (5284800).

Almost surely, 2^28537893 is an apocalyptic number.

It is an amenable number.

28537893 is a deficient number, since it is larger than the sum of its proper divisors (13740507).

28537893 is a wasteful number, since it uses less digits than its factorization.

28537893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1056968 (or 1056962 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 28537893 is about 5342.0869517446. The cubic root of 28537893 is about 305.5910531003.

The spelling of 28537893 in words is "twenty-eight million, five hundred thirty-seven thousand, eight hundred ninety-three".