28390032 has 60 divisors (see below), whose sum is σ = 86680464. Its totient is φ = 8602560.

The previous prime is 28390003. The next prime is 28390091. The reversal of 28390032 is 23009382.

It is a super-2 number, since 2×28390032² = 1611987833922048, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28389978 and 28390005.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7378 + ... + 10545.

Almost surely, 2^28390032 is an apocalyptic number.

28390032 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

28390032 is an abundant number, since it is smaller than the sum of its proper divisors (58290432).

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

28390032 is a wasteful number, since it uses less digits than its factorization.

28390032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17948 (or 17939 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 28390032 is about 5328.2297247773. The cubic root of 28390032 is about 305.0623611624.

The spelling of 28390032 in words is "twenty-eight million, three hundred ninety thousand, thirty-two".