90000073 has 2 divisors, whose sum is σ = 90000074. Its totient is φ = 90000072.

The previous prime is 90000059. The next prime is 90000083. The reversal of 90000073 is 37000009.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87086224 + 2913849 = 9332^2 + 1707^2 .

It is a cyclic number.

It is not a de Polignac number, because 90000073 - 2¹⁷ = 89869001 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 90000073.

It is not a weakly prime, because it can be changed into another prime (90000083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45000036 + 45000037.

It is an arithmetic number, because the mean of its divisors is an integer number (45000037).

Almost surely, 2^90000073 is an apocalyptic number.

It is an amenable number.

90000073 is a deficient number, since it is larger than the sum of its proper divisors (1).

90000073 is an equidigital number, since it uses as much as digits as its factorization.

90000073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 189, while the sum is 19.

The square root of 90000073 is about 9486.8368279422. The cubic root of 90000073 is about 448.1405958196.

The spelling of 90000073 in words is "ninety million, seventy-three", and thus it is an aban number and an uban number.