90840724 has 24 divisors (see below), whose sum is σ = 181272168. Its totient is φ = 39459840.

The previous prime is 90840719. The next prime is 90840733. The reversal of 90840724 is 42704809.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 35784324 + 55056400 = 5982^2 + 7420^2 .

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a self number, because there is not a number n which added to its sum of digits gives 90840724.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50497 + ... + 52264.

It is an arithmetic number, because the mean of its divisors is an integer number (7553007).

Almost surely, 2^90840724 is an apocalyptic number.

It is an amenable number.

90840724 is a deficient number, since it is larger than the sum of its proper divisors (90431444).

90840724 is a wasteful number, since it uses less digits than its factorization.

90840724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102795 (or 102793 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 34.

The square root of 90840724 is about 9531.0400271954. The cubic root of 90840724 is about 449.5315685184.

The spelling of 90840724 in words is "ninety million, eight hundred forty thousand, seven hundred twenty-four".