90788643 has 24 divisors (see below), whose sum is σ = 143363376. Its totient is φ = 54907200.

The previous prime is 90788641. The next prime is 90788651. The reversal of 90788643 is 34688709.

It is a happy number.

It is not a de Polignac number, because 90788643 - 2¹ = 90788641 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90788641) 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 23 ways as a sum of consecutive naturals, for example, 80721 + ... + 81837.

It is an arithmetic number, because the mean of its divisors is an integer number (5973474).

Almost surely, 2^90788643 is an apocalyptic number.

90788643 is a deficient number, since it is larger than the sum of its proper divisors (52574733).

90788643 is a wasteful number, since it uses less digits than its factorization.

90788643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1955 (or 1952 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 90788643 is about 9528.3074572560. The cubic root of 90788643 is about 449.4456432922.

The spelling of 90788643 in words is "ninety million, seven hundred eighty-eight thousand, six hundred forty-three".