871978025 has 18 divisors (see below), whose sum is σ = 1148606730. Its totient is φ = 656542720.

The previous prime is 871978007. The next prime is 871978057. The reversal of 871978025 is 520879178.

It can be written as a sum of positive squares in 9 ways, for example, as 11377129 + 860600896 = 3373^2 + 29336^2 .

It is not a de Polignac number, because 871978025 - 2⁶ = 871977961 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 53120 + ... + 67569.

It is an arithmetic number, because the mean of its divisors is an integer number (63811485).

Almost surely, 2^871978025 is an apocalyptic number.

871978025 is a gapful number since it is divisible by the number (85) formed by its first and last digit.

It is an amenable number.

871978025 is a deficient number, since it is larger than the sum of its proper divisors (276628705).

871978025 is a wasteful number, since it uses less digits than its factorization.

871978025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120733 (or 120711 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 47.

The square root of 871978025 is about 29529.2740344222. The cubic root of 871978025 is about 955.3632108021.

The spelling of 871978025 in words is "eight hundred seventy-one million, nine hundred seventy-eight thousand, twenty-five".