90078673 has 2 divisors, whose sum is σ = 90078674. Its totient is φ = 90078672.

The previous prime is 90078661. The next prime is 90078719. The reversal of 90078673 is 37687009.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 81216144 + 8862529 = 9012^2 + 2977^2 .

It is an emirp because it is prime and its reverse (37687009) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90078673 - 2¹⁷ = 89947601 is a prime.

It is a super-2 number, since 2×90078673² = 16228334658881858, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (90078473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45039336 + 45039337.

It is an arithmetic number, because the mean of its divisors is an integer number (45039337).

Almost surely, 2^90078673 is an apocalyptic number.

It is an amenable number.

90078673 is a deficient number, since it is larger than the sum of its proper divisors (1).

90078673 is an equidigital number, since it uses as much as digits as its factorization.

90078673 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 63504, while the sum is 40.

The square root of 90078673 is about 9490.9785059287. The cubic root of 90078673 is about 448.2710164611.

The spelling of 90078673 in words is "ninety million, seventy-eight thousand, six hundred seventy-three".