978861599 has 8 divisors (see below), whose sum is σ = 1002102672. Its totient is φ = 955886400.

The previous prime is 978861557. The next prime is 978861601. The reversal of 978861599 is 995168879.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-978861599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978861509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59009 + ... + 73754.

It is an arithmetic number, because the mean of its divisors is an integer number (125262834).

Almost surely, 2^978861599 is an apocalyptic number.

978861599 is a deficient number, since it is larger than the sum of its proper divisors (23241073).

978861599 is a wasteful number, since it uses less digits than its factorization.

978861599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132937.

The product of its digits is 9797760, while the sum is 62.

The square root of 978861599 is about 31286.7639585816. The cubic root of 978861599 is about 992.9036269437.

The spelling of 978861599 in words is "nine hundred seventy-eight million, eight hundred sixty-one thousand, five hundred ninety-nine".