90280871 has 4 divisors (see below), whose sum is σ = 90991872. Its totient is φ = 89569872.

The previous prime is 90280867. The next prime is 90280873. The reversal of 90280871 is 17808209.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17808209 = 197 ⋅90397.

It is a cyclic number.

It is not a de Polignac number, because 90280871 - 2² = 90280867 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90280873) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 355310 + ... + 355563.

It is an arithmetic number, because the mean of its divisors is an integer number (22747968).

Almost surely, 2^90280871 is an apocalyptic number.

90280871 is a deficient number, since it is larger than the sum of its proper divisors (711001).

90280871 is a wasteful number, since it uses less digits than its factorization.

90280871 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 711000.

The product of its (nonzero) digits is 8064, while the sum is 35.

The square root of 90280871 is about 9501.6246505532. The cubic root of 90280871 is about 448.6061744789.

The spelling of 90280871 in words is "ninety million, two hundred eighty thousand, eight hundred seventy-one".