90420877 has 2 divisors, whose sum is σ = 90420878. Its totient is φ = 90420876.

The previous prime is 90420839. The next prime is 90420881. The reversal of 90420877 is 77802409.

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., 81830116 + 8590761 = 9046^2 + 2931^2 .

It is an emirp because it is prime and its reverse (77802409) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90420877 - 2⁷ = 90420749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90420817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45210438 + 45210439.

It is an arithmetic number, because the mean of its divisors is an integer number (45210439).

Almost surely, 2^90420877 is an apocalyptic number.

It is an amenable number.

90420877 is a deficient number, since it is larger than the sum of its proper divisors (1).

90420877 is an equidigital number, since it uses as much as digits as its factorization.

90420877 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 28224, while the sum is 37.

The square root of 90420877 is about 9508.9892733140. The cubic root of 90420877 is about 448.8379515850.

The spelling of 90420877 in words is "ninety million, four hundred twenty thousand, eight hundred seventy-seven".