90144489 has 8 divisors (see below), whose sum is σ = 127262880. Its totient is φ = 56561216.

The previous prime is 90144479. The next prime is 90144491. The reversal of 90144489 is 98444109.

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

It is a cyclic number.

It is not a de Polignac number, because 90144489 - 2⁸ = 90144233 is a prime.

It is a super-2 number, since 2×90144489² = 16252057794142242, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (90144479) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 883719 + ... + 883820.

It is an arithmetic number, because the mean of its divisors is an integer number (15907860).

Almost surely, 2^90144489 is an apocalyptic number.

It is an amenable number.

90144489 is a deficient number, since it is larger than the sum of its proper divisors (37118391).

90144489 is a wasteful number, since it uses less digits than its factorization.

90144489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767559.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 90144489 is about 9494.4451654639. The cubic root of 90144489 is about 448.3801663171.

The spelling of 90144489 in words is "ninety million, one hundred forty-four thousand, four hundred eighty-nine".