90438833 has 2 divisors, whose sum is σ = 90438834. Its totient is φ = 90438832.

The previous prime is 90438809. The next prime is 90438839. The reversal of 90438833 is 33883409.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64754209 + 25684624 = 8047^2 + 5068^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90438833 is a prime.

It is not a weakly prime, because it can be changed into another prime (90438839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45219416 + 45219417.

It is an arithmetic number, because the mean of its divisors is an integer number (45219417).

Almost surely, 2^90438833 is an apocalyptic number.

It is an amenable number.

90438833 is a deficient number, since it is larger than the sum of its proper divisors (1).

90438833 is an equidigital number, since it uses as much as digits as its factorization.

90438833 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 90438833 is about 9509.9333856763. The cubic root of 90438833 is about 448.8676600664.

The spelling of 90438833 in words is "ninety million, four hundred thirty-eight thousand, eight hundred thirty-three".