28513506 has 32 divisors (see below), whose sum is σ = 65374848. Its totient is φ = 8121600.

The previous prime is 28513501. The next prime is 28513517. The reversal of 28513506 is 60531582.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28513501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15996 + ... + 17688.

It is an arithmetic number, because the mean of its divisors is an integer number (2042964).

Almost surely, 2^28513506 is an apocalyptic number.

28513506 is an abundant number, since it is smaller than the sum of its proper divisors (36861342).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28513506 is a wasteful number, since it uses less digits than its factorization.

28513506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2106.

The product of its (nonzero) digits is 7200, while the sum is 30.

The square root of 28513506 is about 5339.8039289847. The cubic root of 28513506 is about 305.5039808832.

The spelling of 28513506 in words is "twenty-eight million, five hundred thirteen thousand, five hundred six".