90388649 has 16 divisors (see below), whose sum is σ = 99671040. Its totient is φ = 81459840.

The previous prime is 90388631. The next prime is 90388663. The reversal of 90388649 is 94688309.

It is a cyclic number.

It is not a de Polignac number, because 90388649 - 2⁸ = 90388393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (90388349) 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 15 ways as a sum of consecutive naturals, for example, 146189 + ... + 146805.

It is an arithmetic number, because the mean of its divisors is an integer number (6229440).

Almost surely, 2^90388649 is an apocalyptic number.

It is an amenable number.

90388649 is a deficient number, since it is larger than the sum of its proper divisors (9282391).

90388649 is a wasteful number, since it uses less digits than its factorization.

90388649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 880.

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 90388649 is about 9507.2945152656. The cubic root of 90388649 is about 448.7846199913.

The spelling of 90388649 in words is "ninety million, three hundred eighty-eight thousand, six hundred forty-nine".