28587890 has 16 divisors (see below), whose sum is σ = 53118720. Its totient is φ = 11066160.

The previous prime is 28587887. The next prime is 28587893. The reversal of 28587890 is 9878582.

It is an interprime number because it is at equal distance from previous prime (28587887) and next prime (28587893).

It is not an unprimeable number, because it can be changed into a prime (28587893) 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, 45800 + ... + 46419.

It is an arithmetic number, because the mean of its divisors is an integer number (3319920).

Almost surely, 2^28587890 is an apocalyptic number.

28587890 is a deficient number, since it is larger than the sum of its proper divisors (24530830).

28587890 is a wasteful number, since it uses less digits than its factorization.

28587890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92257.

The product of its (nonzero) digits is 322560, while the sum is 47.

The square root of 28587890 is about 5346.7644421650. The cubic root of 28587890 is about 305.7694092025.

The spelling of 28587890 in words is "twenty-eight million, five hundred eighty-seven thousand, eight hundred ninety".