28146990 has 16 divisors (see below), whose sum is σ = 67552848. Its totient is φ = 7505856.

The previous prime is 28146967. The next prime is 28146991. The reversal of 28146990 is 9964182.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28146991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 469087 + ... + 469146.

It is an arithmetic number, because the mean of its divisors is an integer number (4222053).

Almost surely, 2^28146990 is an apocalyptic number.

28146990 is an abundant number, since it is smaller than the sum of its proper divisors (39405858).

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

28146990 is a wasteful number, since it uses less digits than its factorization.

28146990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 938243.

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 28146990 is about 5305.3736908912. The cubic root of 28146990 is about 304.1893369813.

The spelling of 28146990 in words is "twenty-eight million, one hundred forty-six thousand, nine hundred ninety".