872785789 has 4 divisors (see below), whose sum is σ = 875574556. Its totient is φ = 869997024.

The previous prime is 872785787. The next prime is 872785813. The reversal of 872785789 is 987587278.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 133217764 + 739568025 = 11542^2 + 27195^2 .

It is a cyclic number.

It is not a de Polignac number, because 872785789 - 2¹ = 872785787 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872785787) 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, 1393914 + ... + 1394539.

It is an arithmetic number, because the mean of its divisors is an integer number (218893639).

Almost surely, 2^872785789 is an apocalyptic number.

It is an amenable number.

872785789 is a deficient number, since it is larger than the sum of its proper divisors (2788767).

872785789 is a wasteful number, since it uses less digits than its factorization.

872785789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2788766.

The product of its digits is 15805440, while the sum is 61.

The square root of 872785789 is about 29542.9482110368. The cubic root of 872785789 is about 955.6581226066.

The spelling of 872785789 in words is "eight hundred seventy-two million, seven hundred eighty-five thousand, seven hundred eighty-nine".