90872289 has 6 divisors (see below), whose sum is σ = 131259986. Its totient is φ = 60581520.

The previous prime is 90872281. The next prime is 90872303. The reversal of 90872289 is 98227809.

It can be written as a sum of positive squares in only one way, i.e., 69555600 + 21316689 = 8340^2 + 4617^2 .

It is not a de Polignac number, because 90872289 - 2³ = 90872281 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90872281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5048452 + ... + 5048469.

Almost surely, 2^90872289 is an apocalyptic number.

It is an amenable number.

90872289 is a deficient number, since it is larger than the sum of its proper divisors (40387697).

90872289 is a wasteful number, since it uses less digits than its factorization.

90872289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10096927 (or 10096924 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 90872289 is about 9532.6957887053. The cubic root of 90872289 is about 449.5836296798.

The spelling of 90872289 in words is "ninety million, eight hundred seventy-two thousand, two hundred eighty-nine".