90709771 has 4 divisors (see below), whose sum is σ = 91402344. Its totient is φ = 90017200.

The previous prime is 90709763. The next prime is 90709789. The reversal of 90709771 is 17790709.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17790709 = 2819 ⋅6311.

It is a cyclic number.

It is not a de Polignac number, because 90709771 - 2³ = 90709763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90709271) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 346090 + ... + 346351.

It is an arithmetic number, because the mean of its divisors is an integer number (22850586).

Almost surely, 2^90709771 is an apocalyptic number.

90709771 is a deficient number, since it is larger than the sum of its proper divisors (692573).

90709771 is a wasteful number, since it uses less digits than its factorization.

90709771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 692572.

The product of its (nonzero) digits is 27783, while the sum is 40.

The square root of 90709771 is about 9524.1677326683. The cubic root of 90709771 is about 449.3154546628.

The spelling of 90709771 in words is "ninety million, seven hundred nine thousand, seven hundred seventy-one".