90489749 has 8 divisors (see below), whose sum is σ = 103558848. Its totient is φ = 77456160.

The previous prime is 90489727. The next prime is 90489757. The reversal of 90489749 is 94798409.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90489749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 90489697 and 90489706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90489719) by changing a digit.

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, 3167 + ... + 13820.

It is an arithmetic number, because the mean of its divisors is an integer number (12944856).

Almost surely, 2^90489749 is an apocalyptic number.

It is an amenable number.

90489749 is a deficient number, since it is larger than the sum of its proper divisors (13069099).

90489749 is a wasteful number, since it uses less digits than its factorization.

90489749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17755.

The product of its (nonzero) digits is 653184, while the sum is 50.

The square root of 90489749 is about 9512.6099993640. The cubic root of 90489749 is about 448.9518800024.

The spelling of 90489749 in words is "ninety million, four hundred eighty-nine thousand, seven hundred forty-nine".