90000689621 has 8 divisors (see below), whose sum is σ = 95299392024. Its totient is φ = 84702492160.

The previous prime is 90000689591. The next prime is 90000689629. The reversal of 90000689621 is 12698600009.

It can be written as a sum of positive squares in 4 ways, for example, as 23565627121 + 66435062500 = 153511^2 + 257750^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 90000689621 - 2¹⁴ = 90000673237 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90000689629) 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, 277691 + ... + 507063.

It is an arithmetic number, because the mean of its divisors is an integer number (11912424003).

Almost surely, 2^90000689621 is an apocalyptic number.

It is an amenable number.

90000689621 is a deficient number, since it is larger than the sum of its proper divisors (5298702403).

90000689621 is a wasteful number, since it uses less digits than its factorization.

90000689621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252471.

The product of its (nonzero) digits is 46656, while the sum is 41.

The spelling of 90000689621 in words is "ninety billion, six hundred eighty-nine thousand, six hundred twenty-one".