971028639 has 36 divisors (see below), whose sum is σ = 1640840760. Its totient is φ = 551728800.

The previous prime is 971028607. The next prime is 971028647. The reversal of 971028639 is 936820179.

971028639 is a `hidden beast` number, since 9 + 7 + 1 + 0 + 2 + 8 + 639 = 666.

It is not a de Polignac number, because 971028639 - 2⁵ = 971028607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 971028594 and 971028603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (971028239) by changing a digit.

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 35 ways as a sum of consecutive naturals, for example, 72789 + ... + 85089.

It is an arithmetic number, because the mean of its divisors is an integer number (45578910).

Almost surely, 2^971028639 is an apocalyptic number.

971028639 is a deficient number, since it is larger than the sum of its proper divisors (669812121).

971028639 is a wasteful number, since it uses less digits than its factorization.

971028639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12500 (or 12490 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 971028639 is about 31161.3324330010. The cubic root of 971028639 is about 990.2480890340.

The spelling of 971028639 in words is "nine hundred seventy-one million, twenty-eight thousand, six hundred thirty-nine".