90066861 has 6 divisors (see below), whose sum is σ = 130096590. Its totient is φ = 60044568.

The previous prime is 90066841. The next prime is 90066877. The reversal of 90066861 is 16866009.

It can be written as a sum of positive squares in only one way, i.e., 79762761 + 10304100 = 8931^2 + 3210^2 .

It is not a de Polignac number, because 90066861 - 2⁷ = 90066733 is a prime.

It is a super-2 number, since 2×90066861² = 16224078900786642, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90066841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5003706 + ... + 5003723.

It is an arithmetic number, because the mean of its divisors is an integer number (21682765).

Almost surely, 2^90066861 is an apocalyptic number.

It is an amenable number.

90066861 is a deficient number, since it is larger than the sum of its proper divisors (40029729).

90066861 is a wasteful number, since it uses less digits than its factorization.

90066861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10007435 (or 10007432 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 90066861 is about 9490.3562103854. The cubic root of 90066861 is about 448.2514217056.

The spelling of 90066861 in words is "ninety million, sixty-six thousand, eight hundred sixty-one".