90684729 has 6 divisors (see below), whose sum is σ = 130989066. Its totient is φ = 60456480.

The previous prime is 90684719. The next prime is 90684733. The reversal of 90684729 is 92748609.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 71368704 + 19316025 = 8448^2 + 4395^2 .

It is a de Polignac number, because none of the positive numbers 2^k-90684729 is a prime.

It is not an unprimeable number, because it can be changed into a prime (90684709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5038032 + ... + 5038049.

It is an arithmetic number, because the mean of its divisors is an integer number (21831511).

Almost surely, 2^90684729 is an apocalyptic number.

It is an amenable number.

90684729 is a deficient number, since it is larger than the sum of its proper divisors (40304337).

90684729 is a wasteful number, since it uses less digits than its factorization.

90684729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10076087 (or 10076084 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 90684729 is about 9522.8529863692. The cubic root of 90684729 is about 449.2741037585.

The spelling of 90684729 in words is "ninety million, six hundred eighty-four thousand, seven hundred twenty-nine".