90840077 has 2 divisors, whose sum is σ = 90840078. Its totient is φ = 90840076.

The previous prime is 90840073. The next prime is 90840149. The reversal of 90840077 is 77004809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46936201 + 43903876 = 6851^2 + 6626^2 .

It is a cyclic number.

It is not a de Polignac number, because 90840077 - 2² = 90840073 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90840073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45420038 + 45420039.

It is an arithmetic number, because the mean of its divisors is an integer number (45420039).

Almost surely, 2^90840077 is an apocalyptic number.

It is an amenable number.

90840077 is a deficient number, since it is larger than the sum of its proper divisors (1).

90840077 is an equidigital number, since it uses as much as digits as its factorization.

90840077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 35.

The square root of 90840077 is about 9531.0060854036. The cubic root of 90840077 is about 449.5305012745.

The spelling of 90840077 in words is "ninety million, eight hundred forty thousand, seventy-seven".