28612090 has 32 divisors (see below), whose sum is σ = 56059920. Its totient is φ = 10450944.

The previous prime is 28612079. The next prime is 28612091. The reversal of 28612090 is 9021682.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 1185921 + 27426169 = 1089^2 + 5237^2 .

It is not an unprimeable number, because it can be changed into a prime (28612091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11476 + ... + 13744.

Almost surely, 2^28612090 is an apocalyptic number.

28612090 is a deficient number, since it is larger than the sum of its proper divisors (27447830).

28612090 is a wasteful number, since it uses less digits than its factorization.

28612090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2386.

The product of its (nonzero) digits is 1728, while the sum is 28.

The square root of 28612090 is about 5349.0270143270. The cubic root of 28612090 is about 305.8556640553.

The spelling of 28612090 in words is "twenty-eight million, six hundred twelve thousand, ninety".