821752772 has 12 divisors (see below), whose sum is σ = 1441176576. Its totient is φ = 409988040.

The previous prime is 821752769. The next prime is 821752801. The reversal of 821752772 is 277257128.

It is a super-4 number, since 4×821752772⁴ (a number of 37 digits) contains 4444 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 220004 + ... + 223707.

It is an arithmetic number, because the mean of its divisors is an integer number (120098048).

Almost surely, 2^821752772 is an apocalyptic number.

It is an amenable number.

821752772 is a deficient number, since it is larger than the sum of its proper divisors (619423804).

821752772 is a wasteful number, since it uses less digits than its factorization.

821752772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444178 (or 444176 counting only the distinct ones).

The product of its digits is 109760, while the sum is 41.

The square root of 821752772 is about 28666.2305160619. The cubic root of 821752772 is about 936.6565890657.

The spelling of 821752772 in words is "eight hundred twenty-one million, seven hundred fifty-two thousand, seven hundred seventy-two".