28872401 has 8 divisors (see below), whose sum is σ = 29305800. Its totient is φ = 28441600.

The previous prime is 28872397. The next prime is 28872413. The reversal of 28872401 is 10427882.

28872401 = 3799² + 3800².

It can be written as a sum of positive squares in 4 ways, for example, as 14440000 + 14432401 = 3800^2 + 3799^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28872401 - 2² = 28872397 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28872451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35285 + ... + 36093.

It is an arithmetic number, because the mean of its divisors is an integer number (3663225).

Almost surely, 2^28872401 is an apocalyptic number.

28872401 is the 3800-th centered square number.

It is an amenable number.

28872401 is a deficient number, since it is larger than the sum of its proper divisors (433399).

28872401 is an equidigital number, since it uses as much as digits as its factorization.

28872401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1299.

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 28872401 is about 5373.3044767629. The cubic root of 28872401 is about 306.7804171329.

The spelling of 28872401 in words is "twenty-eight million, eight hundred seventy-two thousand, four hundred one".