28887430 has 32 divisors (see below), whose sum is σ = 61090848. Its totient is φ = 9696000.

The previous prime is 28887407. The next prime is 28887449. The reversal of 28887430 is 3478882.

It is a super-2 number, since 2×28887430² = 1668967224009800, which contains 22 as substring.

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, 8671 + ... + 11530.

It is an arithmetic number, because the mean of its divisors is an integer number (1909089).

Almost surely, 2^28887430 is an apocalyptic number.

28887430 is an abundant number, since it is smaller than the sum of its proper divisors (32203418).

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

28887430 is a wasteful number, since it uses less digits than its factorization.

28887430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20232.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 28887430 is about 5374.7027824802. The cubic root of 28887430 is about 306.8336375437.

The spelling of 28887430 in words is "twenty-eight million, eight hundred eighty-seven thousand, four hundred thirty".