90821955 has 32 divisors (see below), whose sum is σ = 168192000. Its totient is φ = 40989312.

The previous prime is 90821953. The next prime is 90821981. The reversal of 90821955 is 55912809.

It is not a de Polignac number, because 90821955 - 2¹ = 90821953 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90821953) 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, 2821 + ... + 13769.

It is an arithmetic number, because the mean of its divisors is an integer number (5256000).

Almost surely, 2^90821955 is an apocalyptic number.

90821955 is a deficient number, since it is larger than the sum of its proper divisors (77370045).

90821955 is a wasteful number, since it uses less digits than its factorization.

90821955 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11043.

The product of its (nonzero) digits is 32400, while the sum is 39.

The square root of 90821955 is about 9530.0553513608. The cubic root of 90821955 is about 449.5006064902.

The spelling of 90821955 in words is "ninety million, eight hundred twenty-one thousand, nine hundred fifty-five".