90387887 has 2 divisors, whose sum is σ = 90387888. Its totient is φ = 90387886.

The previous prime is 90387881. The next prime is 90387889. The reversal of 90387887 is 78878309.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90387887 is a prime.

Together with 90387889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (90387881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45193943 + 45193944.

It is an arithmetic number, because the mean of its divisors is an integer number (45193944).

Almost surely, 2^90387887 is an apocalyptic number.

90387887 is a deficient number, since it is larger than the sum of its proper divisors (1).

90387887 is an equidigital number, since it uses as much as digits as its factorization.

90387887 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 50.

The square root of 90387887 is about 9507.2544406890. The cubic root of 90387887 is about 448.7833588638.

The spelling of 90387887 in words is "ninety million, three hundred eighty-seven thousand, eight hundred eighty-seven".