28740090 has 64 divisors (see below), whose sum is σ = 71165952. Its totient is φ = 7425600.

The previous prime is 28740079. The next prime is 28740091. The reversal of 28740090 is 9004782.

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

It is not an unprimeable number, because it can be changed into a prime (28740091) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 219325 + ... + 219455.

It is an arithmetic number, because the mean of its divisors is an integer number (1111968).

Almost surely, 2^28740090 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28740090, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35582976).

28740090 is an abundant number, since it is smaller than the sum of its proper divisors (42425862).

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

28740090 is a wasteful number, since it uses less digits than its factorization.

28740090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 315.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 28740090 is about 5360.9784554687. The cubic root of 28740090 is about 306.3110809723.

The spelling of 28740090 in words is "twenty-eight million, seven hundred forty thousand, ninety".