90688381 has 16 divisors (see below), whose sum is σ = 105114240. Its totient is φ = 76639680.

The previous prime is 90688363. The next prime is 90688393. The reversal of 90688381 is 18388609.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90688381 - 2¹¹ = 90686333 is a prime.

It is a super-2 number, since 2×90688381² = 16448764896802322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90688321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 196491 + ... + 196951.

It is an arithmetic number, because the mean of its divisors is an integer number (6569640).

Almost surely, 2^90688381 is an apocalyptic number.

It is an amenable number.

90688381 is a deficient number, since it is larger than the sum of its proper divisors (14425859).

90688381 is a wasteful number, since it uses less digits than its factorization.

90688381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804.

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 90688381 is about 9523.0447336973. The cubic root of 90688381 is about 449.2801346416.

The spelling of 90688381 in words is "ninety million, six hundred eighty-eight thousand, three hundred eighty-one".