978165587 has 12 divisors (see below), whose sum is σ = 1141165080. Its totient is φ = 835996896.

The previous prime is 978165583. The next prime is 978165611. The reversal of 978165587 is 785561879.

It is not a de Polignac number, because 978165587 - 2² = 978165583 is a prime.

It is a super-3 number, since 3×978165587³ (a number of 28 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978165583) 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, 11762 + ... + 45767.

It is an arithmetic number, because the mean of its divisors is an integer number (95097090).

Almost surely, 2^978165587 is an apocalyptic number.

978165587 is a deficient number, since it is larger than the sum of its proper divisors (162999493).

978165587 is a wasteful number, since it uses less digits than its factorization.

978165587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57890 (or 57883 counting only the distinct ones).

The product of its digits is 4233600, while the sum is 56.

The square root of 978165587 is about 31275.6388743699. The cubic root of 978165587 is about 992.6682389860.

The spelling of 978165587 in words is "nine hundred seventy-eight million, one hundred sixty-five thousand, five hundred eighty-seven".