90009770 has 16 divisors (see below), whose sum is σ = 164674728. Its totient is φ = 35413440.

The previous prime is 90009769. The next prime is 90009779. The reversal of 90009770 is 7790009.

It can be written as a sum of positive squares in 4 ways, for example, as 29278921 + 60730849 = 5411^2 + 7793^2 .

It is not an unprimeable number, because it can be changed into a prime (90009779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73169 + ... + 74388.

Almost surely, 2^90009770 is an apocalyptic number.

90009770 is a deficient number, since it is larger than the sum of its proper divisors (74664958).

90009770 is a wasteful number, since it uses less digits than its factorization.

90009770 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147625.

The product of its (nonzero) digits is 3969, while the sum is 32.

The square root of 90009770 is about 9487.3478907438. The cubic root of 90009770 is about 448.1566901150.

Adding to 90009770 its reverse (7790009), we get a palindrome (97799779).

The spelling of 90009770 in words is "ninety million, nine thousand, seven hundred seventy".