28847790 has 48 divisors (see below), whose sum is σ = 77040288. Its totient is φ = 7483968.

The previous prime is 28847783. The next prime is 28847821. The reversal of 28847790 is 9774882.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 23 ways as a sum of consecutive naturals, for example, 1002 + ... + 7661.

It is an arithmetic number, because the mean of its divisors is an integer number (1605006).

Almost surely, 2^28847790 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28847790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38520144).

28847790 is an abundant number, since it is smaller than the sum of its proper divisors (48192498).

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

28847790 is a wasteful number, since it uses less digits than its factorization.

28847790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8713 (or 8710 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 28847790 is about 5371.0138707697. The cubic root of 28847790 is about 306.6932252256.

The spelling of 28847790 in words is "twenty-eight million, eight hundred forty-seven thousand, seven hundred ninety".