28137073 has 4 divisors (see below), whose sum is σ = 29360448. Its totient is φ = 26913700.

The previous prime is 28137071. The next prime is 28137077. The reversal of 28137073 is 37073182.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 28137073 - 2¹ = 28137071 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28137071) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 611653 + ... + 611698.

It is an arithmetic number, because the mean of its divisors is an integer number (7340112).

Almost surely, 2^28137073 is an apocalyptic number.

28137073 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

28137073 is a deficient number, since it is larger than the sum of its proper divisors (1223375).

28137073 is a wasteful number, since it uses less digits than its factorization.

28137073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1223374.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 28137073 is about 5304.4389901289. The cubic root of 28137073 is about 304.1536078795.

The spelling of 28137073 in words is "twenty-eight million, one hundred thirty-seven thousand, seventy-three".