90212685 has 16 divisors (see below), whose sum is σ = 145299840. Its totient is φ = 47793600.

The previous prime is 90212677. The next prime is 90212687. The reversal of 90212685 is 58621209.

It is not a de Polignac number, because 90212685 - 2³ = 90212677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90212687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17650 + ... + 22179.

It is an arithmetic number, because the mean of its divisors is an integer number (9081240).

Almost surely, 2^90212685 is an apocalyptic number.

It is an amenable number.

90212685 is a deficient number, since it is larger than the sum of its proper divisors (55087155).

90212685 is a wasteful number, since it uses less digits than its factorization.

90212685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39988.

The product of its (nonzero) digits is 8640, while the sum is 33.

The square root of 90212685 is about 9498.0358495849. The cubic root of 90212685 is about 448.4932071568.

The spelling of 90212685 in words is "ninety million, two hundred twelve thousand, six hundred eighty-five".