87847987 has 2 divisors, whose sum is σ = 87847988. Its totient is φ = 87847986.

The previous prime is 87847973. The next prime is 87848021. The reversal of 87847987 is 78974878.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87847987 - 2²³ = 79459379 is a prime.

It is not a weakly prime, because it can be changed into another prime (87847957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43923993 + 43923994.

It is an arithmetic number, because the mean of its divisors is an integer number (43923994).

Almost surely, 2^87847987 is an apocalyptic number.

87847987 is a deficient number, since it is larger than the sum of its proper divisors (1).

87847987 is an equidigital number, since it uses as much as digits as its factorization.

87847987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6322176, while the sum is 58.

The square root of 87847987 is about 9372.7256974692. The cubic root of 87847987 is about 444.5397539186.

The spelling of 87847987 in words is "eighty-seven million, eight hundred forty-seven thousand, nine hundred eighty-seven".