90644981 has 16 divisors (see below), whose sum is σ = 107802240. Its totient is φ = 74571840.

The previous prime is 90644947. The next prime is 90645007. The reversal of 90644981 is 18944609.

It is not a de Polignac number, because 90644981 - 2¹⁸ = 90382837 is a prime.

It is a super-2 number, since 2×90644981² = 16433025160980722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90644921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35510 + ... + 37976.

It is an arithmetic number, because the mean of its divisors is an integer number (6737640).

Almost surely, 2^90644981 is an apocalyptic number.

It is an amenable number.

90644981 is a deficient number, since it is larger than the sum of its proper divisors (17157259).

90644981 is a wasteful number, since it uses less digits than its factorization.

90644981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2684.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 90644981 is about 9520.7657780244. The cubic root of 90644981 is about 449.2084537606.

The spelling of 90644981 in words is "ninety million, six hundred forty-four thousand, nine hundred eighty-one".