90728424 has 112 divisors (see below), whose sum is σ = 261270720. Its totient is φ = 29509920.

The previous prime is 90728383. The next prime is 90728441. The reversal of 90728424 is 42482709.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 273939 + ... + 274269.

Almost surely, 2^90728424 is an apocalyptic number.

90728424 is a gapful number since it is divisible by the number (94) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 90728424, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (130635360).

90728424 is an abundant number, since it is smaller than the sum of its proper divisors (170542296).

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

90728424 is a wasteful number, since it uses less digits than its factorization.

90728424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 402 (or 383 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 90728424 is about 9525.1469280006. The cubic root of 90728424 is about 449.3462507085.

The spelling of 90728424 in words is "ninety million, seven hundred twenty-eight thousand, four hundred twenty-four".