90808457 has 2 divisors, whose sum is σ = 90808458. Its totient is φ = 90808456.

The previous prime is 90808453. The next prime is 90808469. The reversal of 90808457 is 75480809.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56010256 + 34798201 = 7484^2 + 5899^2 .

It is an emirp because it is prime and its reverse (75480809) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90808457 - 2² = 90808453 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (90808453) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45404228 + 45404229.

It is an arithmetic number, because the mean of its divisors is an integer number (45404229).

Almost surely, 2^90808457 is an apocalyptic number.

It is an amenable number.

90808457 is a deficient number, since it is larger than the sum of its proper divisors (1).

90808457 is an equidigital number, since it uses as much as digits as its factorization.

90808457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 80640, while the sum is 41.

The square root of 90808457 is about 9529.3471444795. The cubic root of 90808457 is about 449.4783370592.

The spelling of 90808457 in words is "ninety million, eight hundred eight thousand, four hundred fifty-seven".