987658 has 32 divisors (see below), whose sum is σ = 1843200. Its totient is φ = 387504.

The previous prime is 987631. The next prime is 987659. The reversal of 987658 is 856789.

It is a happy number.

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (987659) 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, 12463 + ... + 12541.

It is an arithmetic number, because the mean of its divisors is an integer number (57600).

2⁹⁸⁷⁶⁵⁸ is an apocalyptic number.

987658 is a deficient number, since it is larger than the sum of its proper divisors (855542).

987658 is a wasteful number, since it uses less digits than its factorization.

987658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154.

The product of its digits is 120960, while the sum is 43.

The square root of 987658 is about 993.8098409656. The cubic root of 987658 is about 99.5868957991.

The spelling of 987658 in words is "nine hundred eighty-seven thousand, six hundred fifty-eight".