671090978 has 16 divisors (see below), whose sum is σ = 1037716920. Its totient is φ = 325253376.

The previous prime is 671090977. The next prime is 671090983. The reversal of 671090978 is 879090176.

It can be written as a sum of positive squares in 4 ways, for example, as 437520889 + 233570089 = 20917^2 + 15283^2 .

It is not an unprimeable number, because it can be changed into a prime (671090977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3050 + ... + 36762.

Almost surely, 2^671090978 is an apocalyptic number.

671090978 is a deficient number, since it is larger than the sum of its proper divisors (366625942).

671090978 is a wasteful number, since it uses less digits than its factorization.

671090978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34021.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 671090978 is about 25905.4237178240. The cubic root of 671090978 is about 875.5087014219.

The spelling of 671090978 in words is "six hundred seventy-one million, ninety thousand, nine hundred seventy-eight".