90381540 has 24 divisors (see below), whose sum is σ = 253068480. Its totient is φ = 24101728.

The previous prime is 90381539. The next prime is 90381541. The reversal of 90381540 is 4518309.

It is an interprime number because it is at equal distance from previous prime (90381539) and next prime (90381541).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 90381498 and 90381507.

It is not an unprimeable number, because it can be changed into a prime (90381541) by changing a digit.

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, 753120 + ... + 753239.

It is an arithmetic number, because the mean of its divisors is an integer number (10544520).

Almost surely, 2^90381540 is an apocalyptic number.

It is an amenable number.

90381540 is an abundant number, since it is smaller than the sum of its proper divisors (162686940).

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

90381540 is a wasteful number, since it uses less digits than its factorization.

90381540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1506371 (or 1506369 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

The square root of 90381540 is about 9506.9206370938. The cubic root of 90381540 is about 448.7728541574.

Adding to 90381540 its reverse (4518309), we get a palindrome (94899849).

The spelling of 90381540 in words is "ninety million, three hundred eighty-one thousand, five hundred forty".