28154401 has 6 divisors (see below), whose sum is σ = 30946706. Its totient is φ = 25594800.

The previous prime is 28154393. The next prime is 28154429. The reversal of 28154401 is 10445182.

It can be written as a sum of positive squares in only one way, i.e., 27300625 + 853776 = 5225^2 + 924^2 .

It is not a de Polignac number, because 28154401 - 2³ = 28154393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28154471) 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, 116220 + ... + 116461.

Almost surely, 2^28154401 is an apocalyptic number.

It is an amenable number.

28154401 is a deficient number, since it is larger than the sum of its proper divisors (2792305).

28154401 is a wasteful number, since it uses less digits than its factorization.

28154401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 232703 (or 232692 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 25.

The square root of 28154401 is about 5306.0720877123. The cubic root of 28154401 is about 304.2160319535.

Adding to 28154401 its reverse (10445182), we get a palindrome (38599583).

The spelling of 28154401 in words is "twenty-eight million, one hundred fifty-four thousand, four hundred one".