90581240 has 32 divisors (see below), whose sum is σ = 207658080. Its totient is φ = 35548032.

The previous prime is 90581237. The next prime is 90581251. The reversal of 90581240 is 4218509.

It is a super-2 number, since 2×90581240² = 16409922079875200, which contains 22 as substring.

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, 19244 + ... + 23483.

It is an arithmetic number, because the mean of its divisors is an integer number (6489315).

Almost surely, 2^90581240 is an apocalyptic number.

It is an amenable number.

90581240 is an abundant number, since it is smaller than the sum of its proper divisors (117076840).

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

90581240 is a wasteful number, since it uses less digits than its factorization.

90581240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42791 (or 42787 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 90581240 is about 9517.4177170071. The cubic root of 90581240 is about 449.1031355184.

Adding to 90581240 its reverse (4218509), we get a palindrome (94799749).

The spelling of 90581240 in words is "ninety million, five hundred eighty-one thousand, two hundred forty".