90578087 has 2 divisors, whose sum is σ = 90578088. Its totient is φ = 90578086.

The previous prime is 90578083. The next prime is 90578101. The reversal of 90578087 is 78087509.

It is a weak prime.

It is an emirp because it is prime and its reverse (78087509) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 90578087 - 2² = 90578083 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90578083) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45289043 + 45289044.

It is an arithmetic number, because the mean of its divisors is an integer number (45289044).

Almost surely, 2^90578087 is an apocalyptic number.

90578087 is a deficient number, since it is larger than the sum of its proper divisors (1).

90578087 is an equidigital number, since it uses as much as digits as its factorization.

90578087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 141120, while the sum is 44.

The square root of 90578087 is about 9517.2520718955. The cubic root of 90578087 is about 449.0979245843.

The spelling of 90578087 in words is "ninety million, five hundred seventy-eight thousand, eighty-seven".