90212287 has 8 divisors (see below), whose sum is σ = 98508240. Its totient is φ = 81932160.

The previous prime is 90212273. The next prime is 90212293. The reversal of 90212287 is 78221209.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90212287 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 (90212207) 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, 10183 + ... + 16855.

It is an arithmetic number, because the mean of its divisors is an integer number (12313530).

Almost surely, 2^90212287 is an apocalyptic number.

90212287 is a deficient number, since it is larger than the sum of its proper divisors (8295953).

90212287 is a wasteful number, since it uses less digits than its factorization.

90212287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7913.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 90212287 is about 9498.0148978616. The cubic root of 90212287 is about 448.4925476022.

It can be divided in two parts, 902122 and 87, that added together give a palindrome (902209).

The spelling of 90212287 in words is "ninety million, two hundred twelve thousand, two hundred eighty-seven".