28561401 has 12 divisors (see below), whose sum is σ = 45006000. Its totient is φ = 17309880.

The previous prime is 28561399. The next prime is 28561409. The reversal of 28561401 is 10416582.

It is not a de Polignac number, because 28561401 - 2¹ = 28561399 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28561409) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 144151 + ... + 144348.

It is an arithmetic number, because the mean of its divisors is an integer number (3750500).

Almost surely, 2^28561401 is an apocalyptic number.

It is an amenable number.

28561401 is a deficient number, since it is larger than the sum of its proper divisors (16444599).

28561401 is a wasteful number, since it uses less digits than its factorization.

28561401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288516 (or 288513 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 28561401 is about 5344.2867625156. The cubic root of 28561401 is about 305.6749399617.

Adding to 28561401 its reverse (10416582), we get a palindrome (38977983).

The spelling of 28561401 in words is "twenty-eight million, five hundred sixty-one thousand, four hundred one".