90278099 has 2 divisors, whose sum is σ = 90278100. Its totient is φ = 90278098.

The previous prime is 90278093. The next prime is 90278171. The reversal of 90278099 is 99087209.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 90278099 - 2²⁰ = 89229523 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90278093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45139049 + 45139050.

It is an arithmetic number, because the mean of its divisors is an integer number (45139050).

Almost surely, 2^90278099 is an apocalyptic number.

90278099 is a deficient number, since it is larger than the sum of its proper divisors (1).

90278099 is an equidigital number, since it uses as much as digits as its factorization.

90278099 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81648, while the sum is 44.

The square root of 90278099 is about 9501.4787796427. The cubic root of 90278099 is about 448.6015830705.

The spelling of 90278099 in words is "ninety million, two hundred seventy-eight thousand, ninety-nine".