90771907 has 4 divisors (see below), whose sum is σ = 91161720. Its totient is φ = 90382096.

The previous prime is 90771893. The next prime is 90771917. The reversal of 90771907 is 70917709.

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: 70917709 = 19 ⋅3732511.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90771907 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 90771907.

It is not an unprimeable number, because it can be changed into a prime (90771917) 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, 194557 + ... + 195022.

It is an arithmetic number, because the mean of its divisors is an integer number (22790430).

Almost surely, 2^90771907 is an apocalyptic number.

90771907 is a deficient number, since it is larger than the sum of its proper divisors (389813).

90771907 is a wasteful number, since it uses less digits than its factorization.

90771907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389812.

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

The square root of 90771907 is about 9527.4291915500. The cubic root of 90771907 is about 449.4180246229.

The spelling of 90771907 in words is "ninety million, seven hundred seventy-one thousand, nine hundred seven".