84447987 has 16 divisors (see below), whose sum is σ = 124218528. Its totient is φ = 50699520.

The previous prime is 84447983. The next prime is 84447991. The reversal of 84447987 is 78974448.

It is an interprime number because it is at equal distance from previous prime (84447983) and next prime (84447991).

It is not a de Polignac number, because 84447987 - 2² = 84447983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84447983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24808 + ... + 28005.

It is an arithmetic number, because the mean of its divisors is an integer number (7763658).

Almost surely, 2^84447987 is an apocalyptic number.

84447987 is a deficient number, since it is larger than the sum of its proper divisors (39770541).

84447987 is a wasteful number, since it uses less digits than its factorization.

84447987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52870.

The product of its digits is 1806336, while the sum is 51.

The square root of 84447987 is about 9189.5585856993. The cubic root of 84447987 is about 438.7290925988.

The spelling of 84447987 in words is "eighty-four million, four hundred forty-seven thousand, nine hundred eighty-seven".