28990587 has 8 divisors (see below), whose sum is σ = 39476736. Its totient is φ = 18915752.

The previous prime is 28990571. The next prime is 28990597. The reversal of 28990587 is 78509982.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28990587 - 2⁴ = 28990571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28990537) 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, 102663 + ... + 102944.

It is an arithmetic number, because the mean of its divisors is an integer number (4934592).

Almost surely, 2^28990587 is an apocalyptic number.

28990587 is a deficient number, since it is larger than the sum of its proper divisors (10486149).

28990587 is a wasteful number, since it uses less digits than its factorization.

28990587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205657.

The product of its (nonzero) digits is 362880, while the sum is 48.

The square root of 28990587 is about 5384.2907610938. The cubic root of 28990587 is about 307.1984379159.

The spelling of 28990587 in words is "twenty-eight million, nine hundred ninety thousand, five hundred eighty-seven".