90781432 has 16 divisors (see below), whose sum is σ = 194531760. Its totient is φ = 38906304.

The previous prime is 90781417. The next prime is 90781433. The reversal of 90781432 is 23418709.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90781433) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 810493 + ... + 810604.

It is an arithmetic number, because the mean of its divisors is an integer number (12158235).

Almost surely, 2^90781432 is an apocalyptic number.

It is an amenable number.

90781432 is an abundant number, since it is smaller than the sum of its proper divisors (103750328).

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

90781432 is a wasteful number, since it uses less digits than its factorization.

90781432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1621110 (or 1621106 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 90781432 is about 9527.9290509533. The cubic root of 90781432 is about 449.4337437189.

The spelling of 90781432 in words is "ninety million, seven hundred eighty-one thousand, four hundred thirty-two".