28145790 has 48 divisors (see below), whose sum is σ = 76366368. Its totient is φ = 7178688.

The previous prime is 28145723. The next prime is 28145791. The reversal of 28145790 is 9754182.

28145790 is a `hidden beast` number, since 2 + 81 + 4 + 579 + 0 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28145791) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4729 + ... + 8868.

It is an arithmetic number, because the mean of its divisors is an integer number (1590966).

Almost surely, 2^28145790 is an apocalyptic number.

28145790 is an abundant number, since it is smaller than the sum of its proper divisors (48220578).

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

28145790 is a wasteful number, since it uses less digits than its factorization.

28145790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13633 (or 13630 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 28145790 is about 5305.2605968039. The cubic root of 28145790 is about 304.1850140514.

The spelling of 28145790 in words is "twenty-eight million, one hundred forty-five thousand, seven hundred ninety".