978087905 has 8 divisors (see below), whose sum is σ = 1173884712. Its totient is φ = 782350848.

The previous prime is 978087893. The next prime is 978087919. The reversal of 978087905 is 509780879.

It can be written as a sum of positive squares in 4 ways, for example, as 209467729 + 768620176 = 14473^2 + 27724^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 978087905 - 2²² = 973893601 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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, 38399 + ... + 58571.

It is an arithmetic number, because the mean of its divisors is an integer number (146735589).

Almost surely, 2^978087905 is an apocalyptic number.

It is an amenable number.

978087905 is a deficient number, since it is larger than the sum of its proper divisors (195796807).

978087905 is a wasteful number, since it uses less digits than its factorization.

978087905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29875.

The product of its (nonzero) digits is 1270080, while the sum is 53.

The square root of 978087905 is about 31274.3969566161. The cubic root of 978087905 is about 992.6419603761.

The spelling of 978087905 in words is "nine hundred seventy-eight million, eighty-seven thousand, nine hundred five".