978660889 has 4 divisors (see below), whose sum is σ = 983784960. Its totient is φ = 973536820.

The previous prime is 978660887. The next prime is 978660923. The reversal of 978660889 is 988066879.

978660889 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 978660889 - 2¹ = 978660887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (978660887) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2561749 + ... + 2562130.

It is an arithmetic number, because the mean of its divisors is an integer number (245946240).

Almost surely, 2^978660889 is an apocalyptic number.

It is an amenable number.

978660889 is a deficient number, since it is larger than the sum of its proper divisors (5124071).

978660889 is a wasteful number, since it uses less digits than its factorization.

978660889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5124070.

The product of its (nonzero) digits is 10450944, while the sum is 61.

The square root of 978660889 is about 31283.5562076948. The cubic root of 978660889 is about 992.8357592256.

The spelling of 978660889 in words is "nine hundred seventy-eight million, six hundred sixty thousand, eight hundred eighty-nine".