90981992 has 8 divisors (see below), whose sum is σ = 170591250. Its totient is φ = 45490992.

The previous prime is 90981983. The next prime is 90982007. The reversal of 90981992 is 29918909.

It can be written as a sum of positive squares in only one way, i.e., 69322276 + 21659716 = 8326^2 + 4654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5686367 + ... + 5686382.

Almost surely, 2^90981992 is an apocalyptic number.

It is an amenable number.

90981992 is a deficient number, since it is larger than the sum of its proper divisors (79609258).

90981992 is a wasteful number, since it uses less digits than its factorization.

90981992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11372755 (or 11372751 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 47.

The square root of 90981992 is about 9538.4480918019. The cubic root of 90981992 is about 449.7644726326.

The spelling of 90981992 in words is "ninety million, nine hundred eighty-one thousand, nine hundred ninety-two".