28471892 has 6 divisors (see below), whose sum is σ = 49825818. Its totient is φ = 14235944.

The previous prime is 28471871. The next prime is 28471903. The reversal of 28471892 is 29817482.

It can be written as a sum of positive squares in only one way, i.e., 24960016 + 3511876 = 4996^2 + 1874^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3558983 + ... + 3558990.

It is an arithmetic number, because the mean of its divisors is an integer number (8304303).

Almost surely, 2^28471892 is an apocalyptic number.

It is an amenable number.

28471892 is a deficient number, since it is larger than the sum of its proper divisors (21353926).

28471892 is a wasteful number, since it uses less digits than its factorization.

28471892 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7117977 (or 7117975 counting only the distinct ones).

The product of its digits is 64512, while the sum is 41.

The square root of 28471892 is about 5335.9059212096. The cubic root of 28471892 is about 305.3552860570.

The spelling of 28471892 in words is "twenty-eight million, four hundred seventy-one thousand, eight hundred ninety-two".