90239705 has 4 divisors (see below), whose sum is σ = 108287652. Its totient is φ = 72191760.

The previous prime is 90239701. The next prime is 90239719. The reversal of 90239705 is 50793209.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 50793209 = 877 ⋅57917.

It can be written as a sum of positive squares in 2 ways, for example, as 19545241 + 70694464 = 4421^2 + 8408^2 .

It is not a de Polignac number, because 90239705 - 2² = 90239701 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (90239701) 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, 9023966 + ... + 9023975.

It is an arithmetic number, because the mean of its divisors is an integer number (27071913).

Almost surely, 2^90239705 is an apocalyptic number.

It is an amenable number.

90239705 is a deficient number, since it is larger than the sum of its proper divisors (18047947).

90239705 is a wasteful number, since it uses less digits than its factorization.

90239705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18047946.

The product of its (nonzero) digits is 17010, while the sum is 35.

The square root of 90239705 is about 9499.4581424416. The cubic root of 90239705 is about 448.5379794147.

The spelling of 90239705 in words is "ninety million, two hundred thirty-nine thousand, seven hundred five".