90817215 has 32 divisors (see below), whose sum is σ = 148331520. Its totient is φ = 47438976.

The previous prime is 90817211. The next prime is 90817217. The reversal of 90817215 is 51271809.

It is not a de Polignac number, because 90817215 - 2² = 90817211 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90817211) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 204784 + ... + 205226.

It is an arithmetic number, because the mean of its divisors is an integer number (4635360).

Almost surely, 2^90817215 is an apocalyptic number.

90817215 is a deficient number, since it is larger than the sum of its proper divisors (57514305).

90817215 is a wasteful number, since it uses less digits than its factorization.

90817215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 703.

The product of its (nonzero) digits is 5040, while the sum is 33.

The square root of 90817215 is about 9529.8066612078. The cubic root of 90817215 is about 449.4927865384.

The spelling of 90817215 in words is "ninety million, eight hundred seventeen thousand, two hundred fifteen".