28372401 has 6 divisors (see below), whose sum is σ = 40982370. Its totient is φ = 18914928.

The previous prime is 28372397. The next prime is 28372417. The reversal of 28372401 is 10427382.

It can be written as a sum of positive squares in only one way, i.e., 26255376 + 2117025 = 5124^2 + 1455^2 .

It is not a de Polignac number, because 28372401 - 2² = 28372397 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28372481) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1576236 + ... + 1576253.

It is an arithmetic number, because the mean of its divisors is an integer number (6830395).

Almost surely, 2^28372401 is an apocalyptic number.

It is an amenable number.

28372401 is a deficient number, since it is larger than the sum of its proper divisors (12609969).

28372401 is a wasteful number, since it uses less digits than its factorization.

28372401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3152495 (or 3152492 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28372401 is about 5326.5749783515. The cubic root of 28372401 is about 304.9991973463. Note that the first 3 decimals are identical.

Adding to 28372401 its reverse (10427382), we get a palindrome (38799783).

The spelling of 28372401 in words is "twenty-eight million, three hundred seventy-two thousand, four hundred one".