872124781 has 8 divisors (see below), whose sum is σ = 958255200. Its totient is φ = 787135440.

The previous prime is 872124763. The next prime is 872124791. The reversal of 872124781 is 187421278.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 872124781 - 2¹³ = 872116589 is a prime.

It is a super-2 number, since 2×872124781² = 1521203267268595922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (872124751) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283666 + ... + 286723.

It is an arithmetic number, because the mean of its divisors is an integer number (119781900).

Almost surely, 2^872124781 is an apocalyptic number.

It is an amenable number.

872124781 is a deficient number, since it is larger than the sum of its proper divisors (86130419).

872124781 is a wasteful number, since it uses less digits than its factorization.

872124781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 570539.

The product of its digits is 50176, while the sum is 40.

The square root of 872124781 is about 29531.7588538170. The cubic root of 872124781 is about 955.4168044380.

The spelling of 872124781 in words is "eight hundred seventy-two million, one hundred twenty-four thousand, seven hundred eighty-one".