90381815 has 8 divisors (see below), whose sum is σ = 108515040. Its totient is φ = 72267552.

The previous prime is 90381749. The next prime is 90381817. The reversal of 90381815 is 51818309.

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

It is a cyclic number.

It is not a de Polignac number, because 90381815 - 2¹⁶ = 90316279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90381817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9821 + ... + 16649.

It is an arithmetic number, because the mean of its divisors is an integer number (13564380).

Almost surely, 2^90381815 is an apocalyptic number.

90381815 is a deficient number, since it is larger than the sum of its proper divisors (18133225).

90381815 is a wasteful number, since it uses less digits than its factorization.

90381815 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9481.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 90381815 is about 9506.9351002308. The cubic root of 90381815 is about 448.7733093108.

The spelling of 90381815 in words is "ninety million, three hundred eighty-one thousand, eight hundred fifteen".