28571388 has 24 divisors (see below), whose sum is σ = 66762192. Its totient is φ = 9510144.

The previous prime is 28571381. The next prime is 28571401. The reversal of 28571388 is 88317582.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28571381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10506 + ... + 12942.

It is an arithmetic number, because the mean of its divisors is an integer number (2781758).

Almost surely, 2^28571388 is an apocalyptic number.

It is an amenable number.

28571388 is an abundant number, since it is smaller than the sum of its proper divisors (38190804).

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

28571388 is a wasteful number, since it uses less digits than its factorization.

28571388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3421 (or 3419 counting only the distinct ones).

The product of its digits is 107520, while the sum is 42.

The square root of 28571388 is about 5345.2210431375. The cubic root of 28571388 is about 305.7105640297.

The spelling of 28571388 in words is "twenty-eight million, five hundred seventy-one thousand, three hundred eighty-eight".