820532128923 has 80 divisors (see below), whose sum is σ = 1401201315360. Its totient is φ = 474039143424.

The previous prime is 820532128909. The next prime is 820532128939. The reversal of 820532128923 is 329821235028.

820532128923 is a `hidden beast` number, since 8 + 2 + 0 + 532 + 1 + 28 + 92 + 3 = 666.

It is not a de Polignac number, because 820532128923 - 2⁸ = 820532128667 is a prime.

It is not an unprimeable number, because it can be changed into a prime (820532128963) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 7048968 + ... + 7164426.

It is an arithmetic number, because the mean of its divisors is an integer number (17515016442).

Almost surely, 2^820532128923 is an apocalyptic number.

820532128923 is a deficient number, since it is larger than the sum of its proper divisors (580669186437).

820532128923 is a wasteful number, since it uses less digits than its factorization.

820532128923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115898 (or 115889 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 45.

The spelling of 820532128923 in words is "eight hundred twenty billion, five hundred thirty-two million, one hundred twenty-eight thousand, nine hundred twenty-three".