90443857 has 18 divisors (see below), whose sum is σ = 111060738. Its totient is φ = 73428768.

The previous prime is 90443831. The next prime is 90443863. The reversal of 90443857 is 75834409.

It can be written as a sum of positive squares in only one way, i.e., 49688401 + 40755456 = 7049^2 + 6384^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90443857 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90443887) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 15133 + ... + 20245.

It is an arithmetic number, because the mean of its divisors is an integer number (6170041).

Almost surely, 2^90443857 is an apocalyptic number.

It is an amenable number.

90443857 is a deficient number, since it is larger than the sum of its proper divisors (20616881).

90443857 is a wasteful number, since it uses less digits than its factorization.

90443857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5165 (or 5139 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 90443857 is about 9510.1975268656. The cubic root of 90443857 is about 448.8759716486.

The spelling of 90443857 in words is "ninety million, four hundred forty-three thousand, eight hundred fifty-seven".