28428032 has 36 divisors (see below), whose sum is σ = 57088920. Its totient is φ = 14128128.

The previous prime is 28428017. The next prime is 28428053. The reversal of 28428032 is 23082482.

It is a junction number, because it is equal to n+sod(n) for n = 28427986 and 28428004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74819 + ... + 75197.

Almost surely, 2^28428032 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 28428032, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28544460).

28428032 is an abundant number, since it is smaller than the sum of its proper divisors (28660888).

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

28428032 is an equidigital number, since it uses as much as digits as its factorization.

28428032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688 (or 674 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 29.

The square root of 28428032 is about 5331.7944446499. The cubic root of 28428032 is about 305.1984089302.

The spelling of 28428032 in words is "twenty-eight million, four hundred twenty-eight thousand, thirty-two".