90687381 has 8 divisors (see below), whose sum is σ = 122721504. Its totient is φ = 59555760.

The previous prime is 90687371. The next prime is 90687403. The reversal of 90687381 is 18378609.

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

It is not a de Polignac number, because 90687381 - 2¹⁷ = 90556309 is a prime.

It is a super-2 number, since 2×90687381² = 16448402145278322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90687341) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 225390 + ... + 225791.

It is an arithmetic number, because the mean of its divisors is an integer number (15340188).

Almost surely, 2^90687381 is an apocalyptic number.

It is an amenable number.

90687381 is a deficient number, since it is larger than the sum of its proper divisors (32034123).

90687381 is a wasteful number, since it uses less digits than its factorization.

90687381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 451251.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 90687381 is about 9522.9922293363. The cubic root of 90687381 is about 449.2784832658.

The spelling of 90687381 in words is "ninety million, six hundred eighty-seven thousand, three hundred eighty-one".