90021634 has 8 divisors (see below), whose sum is σ = 136659600. Its totient is φ = 44468436.

The previous prime is 90021623. The next prime is 90021637. The reversal of 90021634 is 43612009.

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

It is a junction number, because it is equal to n+sod(n) for n = 90021599 and 90021608.

It is not an unprimeable number, because it can be changed into a prime (90021637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270984 + ... + 271315.

It is an arithmetic number, because the mean of its divisors is an integer number (17082450).

Almost surely, 2^90021634 is an apocalyptic number.

90021634 is a deficient number, since it is larger than the sum of its proper divisors (46637966).

90021634 is a wasteful number, since it uses less digits than its factorization.

90021634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542384.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 90021634 is about 9487.9731239080. The cubic root of 90021634 is about 448.1763794494.

The spelling of 90021634 in words is "ninety million, twenty-one thousand, six hundred thirty-four".