90687749 has 2 divisors, whose sum is σ = 90687750. Its totient is φ = 90687748.

The previous prime is 90687739. The next prime is 90687757. The reversal of 90687749 is 94778609.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 87422500 + 3265249 = 9350^2 + 1807^2 .

It is a cyclic number.

It is not a de Polignac number, because 90687749 - 2⁴ = 90687733 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 90687697 and 90687706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90687739) 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, 45343874 + 45343875.

It is an arithmetic number, because the mean of its divisors is an integer number (45343875).

Almost surely, 2^90687749 is an apocalyptic number.

It is an amenable number.

90687749 is a deficient number, since it is larger than the sum of its proper divisors (1).

90687749 is an equidigital number, since it uses as much as digits as its factorization.

90687749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 762048, while the sum is 50.

The square root of 90687749 is about 9523.0115509748. The cubic root of 90687749 is about 449.2790909735.

The spelling of 90687749 in words is "ninety million, six hundred eighty-seven thousand, seven hundred forty-nine".