90000637 has 4 divisors (see below), whose sum is σ = 90022140. Its totient is φ = 89979136.

The previous prime is 90000611. The next prime is 90000653. The reversal of 90000637 is 73600009.

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 6625476 + 83375161 = 2574^2 + 9131^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90000637 is a prime.

It is a super-2 number, since 2×90000637² = 16200229320811538, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90000607) 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, 2212 + ... + 13597.

It is an arithmetic number, because the mean of its divisors is an integer number (22505535).

Almost surely, 2^90000637 is an apocalyptic number.

It is an amenable number.

90000637 is a deficient number, since it is larger than the sum of its proper divisors (21503).

90000637 is a wasteful number, since it uses less digits than its factorization.

90000637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21502.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 90000637 is about 9486.8665532936. The cubic root of 90000637 is about 448.1415319328.

The spelling of 90000637 in words is "ninety million, six hundred thirty-seven", and thus it is an aban number.