28137407 has 4 divisors (see below), whose sum is σ = 28151376. Its totient is φ = 28123440.

The previous prime is 28137401. The next prime is 28137413. The reversal of 28137407 is 70473182.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (28137401) and next prime (28137413).

It is a cyclic number.

It is not a de Polignac number, because 28137407 - 2¹⁶ = 28071871 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28137401) 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, 3323 + ... + 8204.

It is an arithmetic number, because the mean of its divisors is an integer number (7037844).

Almost surely, 2^28137407 is an apocalyptic number.

28137407 is a deficient number, since it is larger than the sum of its proper divisors (13969).

28137407 is a wasteful number, since it uses less digits than its factorization.

28137407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13968.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 28137407 is about 5304.4704731010. The cubic root of 28137407 is about 304.1548113559.

The spelling of 28137407 in words is "twenty-eight million, one hundred thirty-seven thousand, four hundred seven".