90242889 has 24 divisors (see below), whose sum is σ = 135851520. Its totient is φ = 53206560.

The previous prime is 90242881. The next prime is 90242897. The reversal of 90242889 is 98824209.

It is an interprime number because it is at equal distance from previous prime (90242881) and next prime (90242897).

It is not a de Polignac number, because 90242889 - 2³ = 90242881 is a prime.

It is a super-4 number, since 4×90242889⁴ (a number of 33 digits) contains 4444 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 90242889.

It is not an unprimeable number, because it can be changed into a prime (90242881) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 10072 + ... + 16790.

It is an arithmetic number, because the mean of its divisors is an integer number (5660480).

Almost surely, 2^90242889 is an apocalyptic number.

It is an amenable number.

90242889 is a deficient number, since it is larger than the sum of its proper divisors (45608631).

90242889 is a wasteful number, since it uses less digits than its factorization.

90242889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6781 (or 6770 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 90242889 is about 9499.6257294696. The cubic root of 90242889 is about 448.5432547279.

The spelling of 90242889 in words is "ninety million, two hundred forty-two thousand, eight hundred eighty-nine".