28696501 has 4 divisors (see below), whose sum is σ = 28707372. Its totient is φ = 28685632.

The previous prime is 28696489. The next prime is 28696511. The reversal of 28696501 is 10569682.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 4431025 + 24265476 = 2105^2 + 4926^2 .

It is a cyclic number.

It is not a de Polignac number, because 28696501 - 2⁵ = 28696469 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 (28696511) 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, 1341 + ... + 7693.

It is an arithmetic number, because the mean of its divisors is an integer number (7176843).

Almost surely, 2^28696501 is an apocalyptic number.

It is an amenable number.

28696501 is a deficient number, since it is larger than the sum of its proper divisors (10871).

28696501 is an equidigital number, since it uses as much as digits as its factorization.

28696501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10870.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 28696501 is about 5356.9115169097. The cubic root of 28696501 is about 306.1561458341.

The spelling of 28696501 in words is "twenty-eight million, six hundred ninety-six thousand, five hundred one".