90720029 has 2 divisors, whose sum is σ = 90720030. Its totient is φ = 90720028.

The previous prime is 90720023. The next prime is 90720059. The reversal of 90720029 is 92002709.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74736025 + 15984004 = 8645^2 + 3998^2 .

It is a cyclic number.

It is not a de Polignac number, because 90720029 - 2⁸ = 90719773 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90719983 and 90720010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90720023) 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 as a sum of consecutive naturals, namely, 45360014 + 45360015.

It is an arithmetic number, because the mean of its divisors is an integer number (45360015).

Almost surely, 2^90720029 is an apocalyptic number.

It is an amenable number.

90720029 is a deficient number, since it is larger than the sum of its proper divisors (1).

90720029 is an equidigital number, since it uses as much as digits as its factorization.

90720029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 90720029 is about 9524.7062421893. The cubic root of 90720029 is about 449.3323911117.

The spelling of 90720029 in words is "ninety million, seven hundred twenty thousand, twenty-nine".