90635381 has 4 divisors (see below), whose sum is σ = 95966892. Its totient is φ = 85303872.

The previous prime is 90635371. The next prime is 90635383. The reversal of 90635381 is 18353609.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 77968900 + 12666481 = 8830^2 + 3559^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90635381 is a prime.

It is a super-2 number, since 2×90635381² = 16429544578030322, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90635383) 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 3 ways as a sum of consecutive naturals, for example, 2665730 + ... + 2665763.

It is an arithmetic number, because the mean of its divisors is an integer number (23991723).

Almost surely, 2^90635381 is an apocalyptic number.

It is an amenable number.

90635381 is a deficient number, since it is larger than the sum of its proper divisors (5331511).

90635381 is a wasteful number, since it uses less digits than its factorization.

90635381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5331510.

The product of its (nonzero) digits is 19440, while the sum is 35.

The square root of 90635381 is about 9520.2616035485. The cubic root of 90635381 is about 449.1925949918.

The spelling of 90635381 in words is "ninety million, six hundred thirty-five thousand, three hundred eighty-one".