875662721 has 4 divisors (see below), whose sum is σ = 876496944. Its totient is φ = 874828500.

The previous prime is 875662703. The next prime is 875662783. The reversal of 875662721 is 127266578.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 127266578 = 2 ⋅63633289.

It is a cyclic number.

It is not a de Polignac number, because 875662721 - 2¹⁰ = 875661697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (875662121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 415535 + ... + 417636.

It is an arithmetic number, because the mean of its divisors is an integer number (219124236).

Almost surely, 2^875662721 is an apocalyptic number.

It is an amenable number.

875662721 is a deficient number, since it is larger than the sum of its proper divisors (834223).

875662721 is a wasteful number, since it uses less digits than its factorization.

875662721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 834222.

The product of its digits is 282240, while the sum is 44.

The square root of 875662721 is about 29591.5988246664. The cubic root of 875662721 is about 956.7070046702.

The spelling of 875662721 in words is "eight hundred seventy-five million, six hundred sixty-two thousand, seven hundred twenty-one".