90387709 has 2 divisors, whose sum is σ = 90387710. Its totient is φ = 90387708.

The previous prime is 90387701. The next prime is 90387719. The reversal of 90387709 is 90778309.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 74563225 + 15824484 = 8635^2 + 3978^2 .

It is a cyclic number.

It is not a de Polignac number, because 90387709 - 2³ = 90387701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90387701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45193854 + 45193855.

It is an arithmetic number, because the mean of its divisors is an integer number (45193855).

Almost surely, 2^90387709 is an apocalyptic number.

It is an amenable number.

90387709 is a deficient number, since it is larger than the sum of its proper divisors (1).

90387709 is an equidigital number, since it uses as much as digits as its factorization.

90387709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 95256, while the sum is 43.

The square root of 90387709 is about 9507.2450794118. The cubic root of 90387709 is about 448.7830642687.

The spelling of 90387709 in words is "ninety million, three hundred eighty-seven thousand, seven hundred nine".