90905919 has 32 divisors (see below), whose sum is σ = 142700544. Its totient is φ = 50941440.

The previous prime is 90905917. The next prime is 90905933. The reversal of 90905919 is 91950909.

It is not a de Polignac number, because 90905919 - 2¹ = 90905917 is a prime.

It is a super-2 number, since 2×90905919² = 16527772218469122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90905917) 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 31 ways as a sum of consecutive naturals, for example, 18342 + ... + 22764.

It is an arithmetic number, because the mean of its divisors is an integer number (4459392).

Almost surely, 2^90905919 is an apocalyptic number.

90905919 is a deficient number, since it is larger than the sum of its proper divisors (51794625).

90905919 is a wasteful number, since it uses less digits than its factorization.

90905919 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4487.

The product of its (nonzero) digits is 32805, while the sum is 42.

The square root of 90905919 is about 9534.4595546890. The cubic root of 90905919 is about 449.6390834485.

The spelling of 90905919 in words is "ninety million, nine hundred five thousand, nine hundred nineteen".