28320501 has 32 divisors (see below), whose sum is σ = 43182720. Its totient is φ = 16352000.

The previous prime is 28320499. The next prime is 28320517. The reversal of 28320501 is 10502382.

It is a cyclic number.

It is not a de Polignac number, because 28320501 - 2¹ = 28320499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28320001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 96511 + ... + 96803.

It is an arithmetic number, because the mean of its divisors is an integer number (1349460).

Almost surely, 2^28320501 is an apocalyptic number.

It is an amenable number.

28320501 is a deficient number, since it is larger than the sum of its proper divisors (14862219).

28320501 is a wasteful number, since it uses less digits than its factorization.

28320501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 437.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 28320501 is about 5321.7009498844. The cubic root of 28320501 is about 304.8131113428.

Adding to 28320501 its reverse (10502382), we get a palindrome (38822883).

The spelling of 28320501 in words is "twenty-eight million, three hundred twenty thousand, five hundred one".