978375845 has 16 divisors (see below), whose sum is σ = 1180398960. Its totient is φ = 778483200.

The previous prime is 978375821. The next prime is 978375847. The reversal of 978375845 is 548573879.

It can be written as a sum of positive squares in 8 ways, for example, as 162588001 + 815787844 = 12751^2 + 28562^2 .

It is not a de Polignac number, because 978375845 - 2⁸ = 978375589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978375847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1285265 + ... + 1286025.

It is an arithmetic number, because the mean of its divisors is an integer number (73774935).

Almost surely, 2^978375845 is an apocalyptic number.

It is an amenable number.

978375845 is a deficient number, since it is larger than the sum of its proper divisors (202023115).

978375845 is a wasteful number, since it uses less digits than its factorization.

978375845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1816.

The product of its digits is 8467200, while the sum is 56.

The square root of 978375845 is about 31279.0000639407. Note that the first 4 decimals coincide. The cubic root of 978375845 is about 992.7393590120.

The spelling of 978375845 in words is "nine hundred seventy-eight million, three hundred seventy-five thousand, eight hundred forty-five".