87445989 has 12 divisors (see below), whose sum is σ = 129392172. Its totient is φ = 56875200.

The previous prime is 87445951. The next prime is 87445993. The reversal of 87445989 is 98954478.

87445989 is a `hidden beast` number, since 8 + 7 + 44 + 598 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5688225 + 81757764 = 2385^2 + 9042^2 .

It is not a de Polignac number, because 87445989 - 2¹⁷ = 87314917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87445289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118122 + ... + 118859.

It is an arithmetic number, because the mean of its divisors is an integer number (10782681).

Almost surely, 2^87445989 is an apocalyptic number.

It is an amenable number.

87445989 is a deficient number, since it is larger than the sum of its proper divisors (41946183).

87445989 is a wasteful number, since it uses less digits than its factorization.

87445989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237028 (or 237025 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 87445989 is about 9351.2560118949. The cubic root of 87445989 is about 443.8606361974.

The spelling of 87445989 in words is "eighty-seven million, four hundred forty-five thousand, nine hundred eighty-nine".