828737672821 has 8 divisors (see below), whose sum is σ = 846445380480. Its totient is φ = 811033089888.

The previous prime is 828737672803. The next prime is 828737672869. The reversal of 828737672821 is 128276737828.

It is a happy number.

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 828737672821 - 2³⁵ = 794377934453 is a prime.

It is a super-2 number, since 2×828737672821² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 828737672821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828737672801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 241131 + ... + 1309816.

It is an arithmetic number, because the mean of its divisors is an integer number (105805672560).

Almost surely, 2^828737672821 is an apocalyptic number.

It is an amenable number.

828737672821 is a deficient number, since it is larger than the sum of its proper divisors (17707707659).

828737672821 is a wasteful number, since it uses less digits than its factorization.

828737672821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1562363.

The product of its digits is 25288704, while the sum is 61.

The spelling of 828737672821 in words is "eight hundred twenty-eight billion, seven hundred thirty-seven million, six hundred seventy-two thousand, eight hundred twenty-one".