90989955 has 96 divisors (see below), whose sum is σ = 198282240. Its totient is φ = 37635840.

The previous prime is 90989939. The next prime is 90989957. The reversal of 90989955 is 55998909.

It is not a de Polignac number, because 90989955 - 2⁴ = 90989939 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90989957) by changing a digit.

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 95 ways as a sum of consecutive naturals, for example, 137325 + ... + 137985.

It is an arithmetic number, because the mean of its divisors is an integer number (2065440).

Almost surely, 2^90989955 is an apocalyptic number.

90989955 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

90989955 is an abundant number, since it is smaller than the sum of its proper divisors (107292285).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

90989955 is a wasteful number, since it uses less digits than its factorization.

90989955 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 721 (or 718 counting only the distinct ones).

The product of its (nonzero) digits is 1312200, while the sum is 54.

The square root of 90989955 is about 9538.8654985800. The cubic root of 90989955 is about 449.7775938007. Note that the first 3 decimals are identical.

The spelling of 90989955 in words is "ninety million, nine hundred eighty-nine thousand, nine hundred fifty-five".