90721582 has 8 divisors (see below), whose sum is σ = 155522736. Its totient is φ = 38880672.

The previous prime is 90721577. The next prime is 90721597. The reversal of 90721582 is 28512709.

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 3240043 + ... + 3240070.

It is an arithmetic number, because the mean of its divisors is an integer number (19440342).

Almost surely, 2^90721582 is an apocalyptic number.

90721582 is a deficient number, since it is larger than the sum of its proper divisors (64801154).

90721582 is a wasteful number, since it uses less digits than its factorization.

90721582 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6480122.

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 90721582 is about 9524.7877666644. The cubic root of 90721582 is about 449.3349550777.

The spelling of 90721582 in words is "ninety million, seven hundred twenty-one thousand, five hundred eighty-two".