90028784 has 20 divisors (see below), whose sum is σ = 178686480. Its totient is φ = 43916160.

The previous prime is 90028769. The next prime is 90028801. The reversal of 90028784 is 48782009.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 67964 + ... + 69275.

It is an arithmetic number, because the mean of its divisors is an integer number (8934324).

Almost surely, 2^90028784 is an apocalyptic number.

It is an amenable number.

90028784 is a deficient number, since it is larger than the sum of its proper divisors (88657696).

90028784 is a wasteful number, since it uses less digits than its factorization.

90028784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137288 (or 137282 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 90028784 is about 9488.3499092308. The cubic root of 90028784 is about 448.1882446576.

The spelling of 90028784 in words is "ninety million, twenty-eight thousand, seven hundred eighty-four".