28130384 has 10 divisors (see below), whose sum is σ = 54502650. Its totient is φ = 14065184.

The previous prime is 28130383. The next prime is 28130411. The reversal of 28130384 is 48303182.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 27793984 + 336400 = 5272^2 + 580^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28130381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 879059 + ... + 879090.

It is an arithmetic number, because the mean of its divisors is an integer number (5450265).

Almost surely, 2^28130384 is an apocalyptic number.

It is an amenable number.

28130384 is a deficient number, since it is larger than the sum of its proper divisors (26372266).

28130384 is a wasteful number, since it uses less digits than its factorization.

28130384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1758157 (or 1758151 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28130384 is about 5303.8084429964. The cubic root of 28130384 is about 304.1295039186.

The spelling of 28130384 in words is "twenty-eight million, one hundred thirty thousand, three hundred eighty-four".