28891590 has 128 divisors (see below), whose sum is σ = 89994240. Its totient is φ = 5764608.

The previous prime is 28891579. The next prime is 28891607. The reversal of 28891590 is 9519882.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51592 + ... + 52148.

It is an arithmetic number, because the mean of its divisors is an integer number (703080).

Almost surely, 2^28891590 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28891590, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44997120).

28891590 is an abundant number, since it is smaller than the sum of its proper divisors (61102650).

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

28891590 is a wasteful number, since it uses less digits than its factorization.

28891590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606.

The product of its (nonzero) digits is 51840, while the sum is 42.

The square root of 28891590 is about 5375.0897666923. The cubic root of 28891590 is about 306.8483655952.

The spelling of 28891590 in words is "twenty-eight million, eight hundred ninety-one thousand, five hundred ninety".