90691447 has 32 divisors (see below), whose sum is σ = 121374720. Its totient is φ = 65594880.

The previous prime is 90691373. The next prime is 90691453. The reversal of 90691447 is 74419609.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 90691447 - 2¹¹ = 90689399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (90691457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 102973 + ... + 103849.

It is an arithmetic number, because the mean of its divisors is an integer number (3792960).

It is a vampire number, since it can be written as 9401 ⋅ 9647 (with its own digits).

Almost surely, 2^90691447 is an apocalyptic number.

90691447 is a deficient number, since it is larger than the sum of its proper divisors (30683273).

90691447 is a wasteful number, since it uses less digits than its factorization.

90691447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991.

The product of its (nonzero) digits is 54432, while the sum is 40.

The square root of 90691447 is about 9523.2057102637. The cubic root of 90691447 is about 449.2851976840.

The spelling of 90691447 in words is "ninety million, six hundred ninety-one thousand, four hundred forty-seven".