90802217 has 4 divisors (see below), whose sum is σ = 99056976. Its totient is φ = 82547460.

The previous prime is 90802213. The next prime is 90802223. The reversal of 90802217 is 71220809.

It is a happy number.

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: 71220809 = 11 ⋅6474619.

It is a cyclic number.

It is not a de Polignac number, because 90802217 - 2² = 90802213 is a prime.

It is a super-2 number, since 2×90802217² = 16490085224230178, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90802217.

It is not an unprimeable number, because it can be changed into a prime (90802211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4127363 + ... + 4127384.

It is an arithmetic number, because the mean of its divisors is an integer number (24764244).

Almost surely, 2^90802217 is an apocalyptic number.

It is an amenable number.

90802217 is a deficient number, since it is larger than the sum of its proper divisors (8254759).

90802217 is a wasteful number, since it uses less digits than its factorization.

90802217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8254758.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 90802217 is about 9529.0197292271. The cubic root of 90802217 is about 449.4680413622.

It can be divided in two parts, 90802 and 217, that added together give a palindrome (91019).

The spelling of 90802217 in words is "ninety million, eight hundred two thousand, two hundred seventeen".