90641550 has 24 divisors (see below), whose sum is σ = 224791416. Its totient is φ = 24171040.

The previous prime is 90641543. The next prime is 90641557. The reversal of 90641550 is 5514609.

It is an interprime number because it is at equal distance from previous prime (90641543) and next prime (90641557).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90641557) 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 11 ways as a sum of consecutive naturals, for example, 301989 + ... + 302288.

It is an arithmetic number, because the mean of its divisors is an integer number (9366309).

Almost surely, 2^90641550 is an apocalyptic number.

90641550 is an abundant number, since it is smaller than the sum of its proper divisors (134149866).

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

90641550 is a wasteful number, since it uses less digits than its factorization.

90641550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604292 (or 604287 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 90641550 is about 9520.5855912333. The cubic root of 90641550 is about 449.2027860313.

The spelling of 90641550 in words is "ninety million, six hundred forty-one thousand, five hundred fifty".