90928405 has 4 divisors (see below), whose sum is σ = 109114092. Its totient is φ = 72742720.

The previous prime is 90928403. The next prime is 90928423. The reversal of 90928405 is 50482909.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67667076 + 23261329 = 8226^2 + 4823^2 .

It is not a de Polignac number, because 90928405 - 2¹ = 90928403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90928403) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9092836 + ... + 9092845.

It is an arithmetic number, because the mean of its divisors is an integer number (27278523).

Almost surely, 2^90928405 is an apocalyptic number.

It is an amenable number.

90928405 is a deficient number, since it is larger than the sum of its proper divisors (18185687).

90928405 is a wasteful number, since it uses less digits than its factorization.

90928405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18185686.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 90928405 is about 9535.6386781379. The cubic root of 90928405 is about 449.6761538286.

The spelling of 90928405 in words is "ninety million, nine hundred twenty-eight thousand, four hundred five".