8725387821 has 8 divisors (see below), whose sum is σ = 11644799040. Its totient is φ = 5811450912.

The previous prime is 8725387793. The next prime is 8725387837. The reversal of 8725387821 is 1287835278.

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

It is not a de Polignac number, because 8725387821 - 2¹⁴ = 8725371437 is a prime.

It is a super-2 number, since 2×8725387821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8725389821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1364856 + ... + 1371233.

It is an arithmetic number, because the mean of its divisors is an integer number (1455599880).

Almost surely, 2^8725387821 is an apocalyptic number.

It is an amenable number.

8725387821 is a deficient number, since it is larger than the sum of its proper divisors (2919411219).

8725387821 is a wasteful number, since it uses less digits than its factorization.

8725387821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2737155.

The product of its digits is 1505280, while the sum is 51.

The square root of 8725387821 is about 93409.7843964967. The cubic root of 8725387821 is about 2058.7087629435.

The spelling of 8725387821 in words is "eight billion, seven hundred twenty-five million, three hundred eighty-seven thousand, eight hundred twenty-one".