28053861 has 32 divisors (see below), whose sum is σ = 43476480. Its totient is φ = 15912000.

The previous prime is 28053821. The next prime is 28053887. The reversal of 28053861 is 16835082.

It is a happy number.

It is not a de Polignac number, because 28053861 - 2¹⁰ = 28052837 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28053821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 63106 + ... + 63548.

It is an arithmetic number, because the mean of its divisors is an integer number (1358640).

Almost surely, 2^28053861 is an apocalyptic number.

It is an amenable number.

28053861 is a deficient number, since it is larger than the sum of its proper divisors (15422619).

28053861 is a wasteful number, since it uses less digits than its factorization.

28053861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 577.

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 28053861 is about 5296.5895631057. The cubic root of 28053861 is about 303.8534792822.

It can be divided in two parts, 2805 and 3861, that added together give a palindrome (6666).

The spelling of 28053861 in words is "twenty-eight million, fifty-three thousand, eight hundred sixty-one".