28900887 has 8 divisors (see below), whose sum is σ = 38559360. Its totient is φ = 19254840.

The previous prime is 28900841. The next prime is 28900889. The reversal of 28900887 is 78800982.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28900887 - 2⁷ = 28900759 is a prime.

It is a super-2 number, since 2×28900887² = 1670522538773538, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28900889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7462 + ... + 10652.

It is an arithmetic number, because the mean of its divisors is an integer number (4819920).

Almost surely, 2^28900887 is an apocalyptic number.

28900887 is a deficient number, since it is larger than the sum of its proper divisors (9658473).

28900887 is a wasteful number, since it uses less digits than its factorization.

28900887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6213.

The product of its (nonzero) digits is 64512, while the sum is 42.

The square root of 28900887 is about 5375.9545198969. The cubic root of 28900887 is about 306.8812755563.

The spelling of 28900887 in words is "twenty-eight million, nine hundred thousand, eight hundred eighty-seven".