90006639 has 8 divisors (see below), whose sum is σ = 120117552. Its totient is φ = 59950080.

The previous prime is 90006571. The next prime is 90006643. The reversal of 90006639 is 93660009.

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

It is a de Polignac number, because none of the positive numbers 2^k-90006639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90006689) 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, 9552 + ... + 16469.

It is an arithmetic number, because the mean of its divisors is an integer number (15014694).

Almost surely, 2^90006639 is an apocalyptic number.

90006639 is a deficient number, since it is larger than the sum of its proper divisors (30110913).

90006639 is a wasteful number, since it uses less digits than its factorization.

90006639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27177.

The product of its (nonzero) digits is 8748, while the sum is 33.

The square root of 90006639 is about 9487.1828800756. The cubic root of 90006639 is about 448.1514936611.

The spelling of 90006639 in words is "ninety million, six thousand, six hundred thirty-nine".