90821505 has 16 divisors (see below), whose sum is σ = 147067200. Its totient is φ = 47853888.

The previous prime is 90821491. The next prime is 90821513. The reversal of 90821505 is 50512809.

It is not a de Polignac number, because 90821505 - 2⁶ = 90821441 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35230 + ... + 37719.

It is an arithmetic number, because the mean of its divisors is an integer number (9191700).

Almost surely, 2^90821505 is an apocalyptic number.

It is an amenable number.

90821505 is a deficient number, since it is larger than the sum of its proper divisors (56245695).

90821505 is a wasteful number, since it uses less digits than its factorization.

90821505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73040.

The product of its (nonzero) digits is 3600, while the sum is 30.

The square root of 90821505 is about 9530.0317418149. The cubic root of 90821505 is about 449.4998641014.

The spelling of 90821505 in words is "ninety million, eight hundred twenty-one thousand, five hundred five".