28145404 has 36 divisors (see below), whose sum is σ = 60673536. Its totient is φ = 11351424.

The previous prime is 28145389. The next prime is 28145407. The reversal of 28145404 is 40454182.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 892 + ... + 7555.

It is an arithmetic number, because the mean of its divisors is an integer number (1685376).

Almost surely, 2^28145404 is an apocalyptic number.

It is an amenable number.

28145404 is an abundant number, since it is smaller than the sum of its proper divisors (32528132).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28145404 is a wasteful number, since it uses less digits than its factorization.

28145404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8482 (or 8473 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 28145404 is about 5305.2242176933. The cubic root of 28145404 is about 304.1836234828.

Adding to 28145404 its reverse (40454182), we get a palindrome (68599586).

The spelling of 28145404 in words is "twenty-eight million, one hundred forty-five thousand, four hundred four".