987639765 has 32 divisors (see below), whose sum is σ = 1807681536. Its totient is φ = 451064640.

The previous prime is 987639761. The next prime is 987639767. The reversal of 987639765 is 567936789.

It is not a de Polignac number, because 987639765 - 2² = 987639761 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 987639699 and 987639708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (987639761) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 124570 + ... + 132260.

It is an arithmetic number, because the mean of its divisors is an integer number (56490048).

Almost surely, 2^987639765 is an apocalyptic number.

It is an amenable number.

987639765 is a deficient number, since it is larger than the sum of its proper divisors (820041771).

987639765 is a wasteful number, since it uses less digits than its factorization.

987639765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8929.

The product of its digits is 17146080, while the sum is 60.

The square root of 987639765 is about 31426.7364675367. The cubic root of 987639765 is about 995.8628290877.

The spelling of 987639765 in words is "nine hundred eighty-seven million, six hundred thirty-nine thousand, seven hundred sixty-five".