90447691 has 4 divisors (see below), whose sum is σ = 90947584. Its totient is φ = 89947800.

The previous prime is 90447631. The next prime is 90447697. The reversal of 90447691 is 19674409.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 90447691 - 2⁷ = 90447563 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90447697) 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, 249675 + ... + 250036.

It is an arithmetic number, because the mean of its divisors is an integer number (22736896).

Almost surely, 2^90447691 is an apocalyptic number.

90447691 is a deficient number, since it is larger than the sum of its proper divisors (499893).

90447691 is a wasteful number, since it uses less digits than its factorization.

90447691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 499892.

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

The square root of 90447691 is about 9510.3990978297. The cubic root of 90447691 is about 448.8823143169.

The spelling of 90447691 in words is "ninety million, four hundred forty-seven thousand, six hundred ninety-one".