90722729 has 2 divisors, whose sum is σ = 90722730. Its totient is φ = 90722728.

The previous prime is 90722717. The next prime is 90722747. The reversal of 90722729 is 92722709.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54096025 + 36626704 = 7355^2 + 6052^2 .

It is a cyclic number.

It is not a de Polignac number, because 90722729 - 2²⁴ = 73945513 is a prime.

It is a super-2 number, since 2×90722729² = 16461227114414882, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 90722692 and 90722701.

It is not a weakly prime, because it can be changed into another prime (90722789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45361364 + 45361365.

It is an arithmetic number, because the mean of its divisors is an integer number (45361365).

Almost surely, 2^90722729 is an apocalyptic number.

It is an amenable number.

90722729 is a deficient number, since it is larger than the sum of its proper divisors (1).

90722729 is an equidigital number, since it uses as much as digits as its factorization.

90722729 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 90722729 is about 9524.8479777895. The cubic root of 90722729 is about 449.3368487287.

The spelling of 90722729 in words is "ninety million, seven hundred twenty-two thousand, seven hundred twenty-nine".