28735590 has 32 divisors (see below), whose sum is σ = 74271456. Its totient is φ = 7073280.

The previous prime is 28735583. The next prime is 28735621. The reversal of 28735590 is 9553782.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36451 + ... + 37230.

It is an arithmetic number, because the mean of its divisors is an integer number (2320983).

Almost surely, 2^28735590 is an apocalyptic number.

28735590 is an abundant number, since it is smaller than the sum of its proper divisors (45535866).

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

28735590 is a wasteful number, since it uses less digits than its factorization.

28735590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73704.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 28735590 is about 5360.5587395345. The cubic root of 28735590 is about 306.2950931795.

The spelling of 28735590 in words is "twenty-eight million, seven hundred thirty-five thousand, five hundred ninety".