28712550 has 48 divisors (see below), whose sum is σ = 72138240. Its totient is φ = 7556640.

The previous prime is 28712539. The next prime is 28712569. The reversal of 28712550 is 5521782.

It is a Harshad number since it is a multiple of its sum of digits (30).

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, 10639 + ... + 13061.

It is an arithmetic number, because the mean of its divisors is an integer number (1502880).

Almost surely, 2^28712550 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28712550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36069120).

28712550 is an abundant number, since it is smaller than the sum of its proper divisors (43425690).

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

28712550 is a wasteful number, since it uses less digits than its factorization.

28712550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2517 (or 2512 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 28712550 is about 5358.4092788812. The cubic root of 28712550 is about 306.2132095191.

The spelling of 28712550 in words is "twenty-eight million, seven hundred twelve thousand, five hundred fifty".