90820297 has 4 divisors (see below), whose sum is σ = 93750016. Its totient is φ = 87890580.

The previous prime is 90820291. The next prime is 90820319. The reversal of 90820297 is 79202809.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79202809 = 7 ⋅11314687.

It is not a de Polignac number, because 90820297 - 2¹¹ = 90818249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90820291) 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, 1464813 + ... + 1464874.

It is an arithmetic number, because the mean of its divisors is an integer number (23437504).

Almost surely, 2^90820297 is an apocalyptic number.

It is an amenable number.

90820297 is a deficient number, since it is larger than the sum of its proper divisors (2929719).

90820297 is a wasteful number, since it uses less digits than its factorization.

90820297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2929718.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 90820297 is about 9529.9683630115. The cubic root of 90820297 is about 449.4978711878.

The spelling of 90820297 in words is "ninety million, eight hundred twenty thousand, two hundred ninety-seven".