978578 has 8 divisors (see below), whose sum is σ = 1472880. Its totient is φ = 487620.

The previous prime is 978569. The next prime is 978599. The reversal of 978578 is 875879.

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

It is a super-2 number, since 2×978578² = 1915229804168, which contains 22 as substring.

It is an Ulam number.

It is a Curzon number.

It is a nialpdrome in base 16.

It is an unprimeable number.

978578 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 113 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (184110).

2⁹⁷⁸⁵⁷⁸ is an apocalyptic number.

978578 is a deficient number, since it is larger than the sum of its proper divisors (494302).

978578 is a wasteful number, since it uses less digits than its factorization.

978578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1672.

The product of its digits is 141120, while the sum is 44.

The square root of 978578 is about 989.2310144754. The cubic root of 978578 is about 99.2807728581.

It can be divided in two parts, 9785 and 78, that multiplied together give a triangular number (763230 = T₁₂₃₅).

The spelling of 978578 in words is "nine hundred seventy-eight thousand, five hundred seventy-eight".