90349681 has 4 divisors (see below), whose sum is σ = 94277952. Its totient is φ = 86421412.

The previous prime is 90349667. The next prime is 90349687. The reversal of 90349681 is 18694309.

It is the 3881-st star number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18694309 = 19 ⋅983911.

It is a cyclic number.

It is not a de Polignac number, because 90349681 - 2¹¹ = 90347633 is a prime.

It is a super-2 number, since 2×90349681² = 16326129713603522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90349687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1964101 + ... + 1964146.

It is an arithmetic number, because the mean of its divisors is an integer number (23569488).

Almost surely, 2^90349681 is an apocalyptic number.

It is an amenable number.

90349681 is a deficient number, since it is larger than the sum of its proper divisors (3928271).

90349681 is a wasteful number, since it uses less digits than its factorization.

90349681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3928270.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 90349681 is about 9505.2449205689. The cubic root of 90349681 is about 448.7201179658.

The spelling of 90349681 in words is "ninety million, three hundred forty-nine thousand, six hundred eighty-one".