90881768 has 16 divisors (see below), whose sum is σ = 175009380. Its totient is φ = 44212608.

The previous prime is 90881767. The next prime is 90881773. The reversal of 90881768 is 86718809.

It can be written as a sum of positive squares in 2 ways, for example, as 90592324 + 289444 = 9518^2 + 538^2 .

It is not an unprimeable number, because it can be changed into a prime (90881767) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153221 + ... + 153812.

Almost surely, 2^90881768 is an apocalyptic number.

It is an amenable number.

90881768 is a deficient number, since it is larger than the sum of its proper divisors (84127612).

90881768 is a wasteful number, since it uses less digits than its factorization.

90881768 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307076 (or 307072 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 47.

The square root of 90881768 is about 9533.1929593395. The cubic root of 90881768 is about 449.5992613430.

The spelling of 90881768 in words is "ninety million, eight hundred eighty-one thousand, seven hundred sixty-eight".