90991048 has 16 divisors (see below), whose sum is σ = 171031500. Its totient is φ = 45382656.

The previous prime is 90991037. The next prime is 90991049. The reversal of 90991048 is 84019909.

It can be written as a sum of positive squares in 2 ways, for example, as 80245764 + 10745284 = 8958^2 + 3278^2 .

It is a super-4 number, since 4×90991048⁴ (a number of 33 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 90991048.

It is not an unprimeable number, because it can be changed into a prime (90991049) 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 3 ways as a sum of consecutive naturals, for example, 10633 + ... + 17176.

Almost surely, 2^90991048 is an apocalyptic number.

It is an amenable number.

90991048 is a deficient number, since it is larger than the sum of its proper divisors (80040452).

90991048 is a wasteful number, since it uses less digits than its factorization.

90991048 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28224 (or 28220 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 90991048 is about 9538.9227903364. The cubic root of 90991048 is about 449.7793947502.

The spelling of 90991048 in words is "ninety million, nine hundred ninety-one thousand, forty-eight".