28428232 has 48 divisors (see below), whose sum is σ = 63365760. Its totient is φ = 11916576.

The previous prime is 28428227. The next prime is 28428251. The reversal of 28428232 is 23282482.

It is a junction number, because it is equal to n+sod(n) for n = 28428194 and 28428203.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17653 + ... + 19195.

It is an arithmetic number, because the mean of its divisors is an integer number (1320120).

Almost surely, 2^28428232 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28428232, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31682880).

28428232 is an abundant number, since it is smaller than the sum of its proper divisors (34937528).

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

28428232 is a wasteful number, since it uses less digits than its factorization.

28428232 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1610 (or 1599 counting only the distinct ones).

The product of its digits is 12288, while the sum is 31.

The square root of 28428232 is about 5331.8132000287. The cubic root of 28428232 is about 305.1991246503.

The spelling of 28428232 in words is "twenty-eight million, four hundred twenty-eight thousand, two hundred thirty-two".