90100638 has 24 divisors (see below), whose sum is σ = 195509808. Its totient is φ = 29988672.

The previous prime is 90100631. The next prime is 90100639. The reversal of 90100638 is 83600109.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90100631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10006 + ... + 16742.

It is an arithmetic number, because the mean of its divisors is an integer number (8146242).

Almost surely, 2^90100638 is an apocalyptic number.

90100638 is an abundant number, since it is smaller than the sum of its proper divisors (105409170).

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

90100638 is a wasteful number, since it uses less digits than its factorization.

90100638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7488 (or 7485 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 90100638 is about 9492.1355868951. The cubic root of 90100638 is about 448.3074493271.

The spelling of 90100638 in words is "ninety million, one hundred thousand, six hundred thirty-eight".