828391431 has 64 divisors (see below), whose sum is σ = 1386823680. Its totient is φ = 429287040.

The previous prime is 828391427. The next prime is 828391433. The reversal of 828391431 is 134193828.

It is not a de Polignac number, because 828391431 - 2² = 828391427 is a prime.

It is a super-2 number, since 2×828391431² = 1372464725908455522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 828391431.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828391433) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 908866 + ... + 909776.

It is an arithmetic number, because the mean of its divisors is an integer number (21669120).

Almost surely, 2^828391431 is an apocalyptic number.

828391431 is a deficient number, since it is larger than the sum of its proper divisors (558432249).

828391431 is a wasteful number, since it uses less digits than its factorization.

828391431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1036.

The product of its digits is 41472, while the sum is 39.

The square root of 828391431 is about 28781.7899200171. The cubic root of 828391431 is about 939.1721362822.

The spelling of 828391431 in words is "eight hundred twenty-eight million, three hundred ninety-one thousand, four hundred thirty-one".