90216709 has 16 divisors (see below), whose sum is σ = 104195520. Its totient is φ = 77333760.

The previous prime is 90216701. The next prime is 90216761. The reversal of 90216709 is 90761209.

It is a cyclic number.

It is not a de Polignac number, because 90216709 - 2³ = 90216701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90216701) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10429 + ... + 17005.

It is an arithmetic number, because the mean of its divisors is an integer number (6512220).

Almost surely, 2^90216709 is an apocalyptic number.

It is an amenable number.

90216709 is a deficient number, since it is larger than the sum of its proper divisors (13978811).

90216709 is a wasteful number, since it uses less digits than its factorization.

90216709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6660.

The product of its (nonzero) digits is 6804, while the sum is 34.

The square root of 90216709 is about 9498.2476804935. The cubic root of 90216709 is about 448.4998755089.

The spelling of 90216709 in words is "ninety million, two hundred sixteen thousand, seven hundred nine".