90581938 has 12 divisors (see below), whose sum is σ = 140400270. Its totient is φ = 43829040.

The previous prime is 90581927. The next prime is 90581971. The reversal of 90581938 is 83918509.

It can be written as a sum of positive squares in only one way, i.e., 90573289 + 8649 = 9517^2 + 93^2 .

It is a junction number, because it is equal to n+sod(n) for n = 90581894 and 90581903.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 21643 + ... + 25486.

Almost surely, 2^90581938 is an apocalyptic number.

90581938 is a deficient number, since it is larger than the sum of its proper divisors (49818332).

90581938 is a wasteful number, since it uses less digits than its factorization.

90581938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47193 (or 47162 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 43.

The square root of 90581938 is about 9517.4543865469. The cubic root of 90581938 is about 449.1042890803.

It can be divided in two parts, 90581 and 938, that added together give a palindrome (91519).

The spelling of 90581938 in words is "ninety million, five hundred eighty-one thousand, nine hundred thirty-eight".