90427691 has 4 divisors (see below), whose sum is σ = 90455400. Its totient is φ = 90399984.

The previous prime is 90427663. The next prime is 90427693. The reversal of 90427691 is 19672409.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19672409 = 2111 ⋅9319.

It is a cyclic number.

It is not a de Polignac number, because 90427691 - 2²² = 86233387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90427693) 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, 8186 + ... + 15743.

It is an arithmetic number, because the mean of its divisors is an integer number (22613850).

Almost surely, 2^90427691 is an apocalyptic number.

90427691 is a deficient number, since it is larger than the sum of its proper divisors (27709).

90427691 is a wasteful number, since it uses less digits than its factorization.

90427691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27708.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 90427691 is about 9509.3475591126. The cubic root of 90427691 is about 448.8492259171.

The spelling of 90427691 in words is "ninety million, four hundred twenty-seven thousand, six hundred ninety-one".