28471830 has 32 divisors (see below), whose sum is σ = 68753664. Its totient is φ = 7545696.

The previous prime is 28471829. The next prime is 28471841. The reversal of 28471830 is 3817482.

It is a junction number, because it is equal to n+sod(n) for n = 28471791 and 28471800.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2169 + ... + 7851.

It is an arithmetic number, because the mean of its divisors is an integer number (2148552).

Almost surely, 2^28471830 is an apocalyptic number.

28471830 is an abundant number, since it is smaller than the sum of its proper divisors (40281834).

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

28471830 is a wasteful number, since it uses less digits than its factorization.

28471830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5860.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 28471830 is about 5335.9001115088. The cubic root of 28471830 is about 305.3550644110.

The spelling of 28471830 in words is "twenty-eight million, four hundred seventy-one thousand, eight hundred thirty".