90872817 has 8 divisors (see below), whose sum is σ = 138472896. Its totient is φ = 51927312.

The previous prime is 90872813. The next prime is 90872833. The reversal of 90872817 is 71827809.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 90872817 - 2² = 90872813 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (90872813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2163618 + ... + 2163659.

It is an arithmetic number, because the mean of its divisors is an integer number (17309112).

Almost surely, 2^90872817 is an apocalyptic number.

It is an amenable number.

90872817 is a deficient number, since it is larger than the sum of its proper divisors (47600079).

90872817 is a wasteful number, since it uses less digits than its factorization.

90872817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4327287.

The product of its (nonzero) digits is 56448, while the sum is 42.

The square root of 90872817 is about 9532.7234828248. The cubic root of 90872817 is about 449.5845004245.

The spelling of 90872817 in words is "ninety million, eight hundred seventy-two thousand, eight hundred seventeen".