90781212 has 24 divisors (see below), whose sum is σ = 212122512. Its totient is φ = 30217600.

The previous prime is 90781199. The next prime is 90781247. The reversal of 90781212 is 21218709.

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 90781212.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4162 + ... + 14102.

It is an arithmetic number, because the mean of its divisors is an integer number (8838438).

Almost surely, 2^90781212 is an apocalyptic number.

It is an amenable number.

90781212 is an abundant number, since it is smaller than the sum of its proper divisors (121341300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90781212 is a wasteful number, since it uses less digits than its factorization.

90781212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10709 (or 10707 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 30.

The square root of 90781212 is about 9527.9175059401. The cubic root of 90781212 is about 449.4333806656.

The spelling of 90781212 in words is "ninety million, seven hundred eighty-one thousand, two hundred twelve".