828349991 has 12 divisors (see below), whose sum is σ = 989639952. Its totient is φ = 679141056.

The previous prime is 828349987. The next prime is 828349993. The reversal of 828349991 is 199943828.

It is not a de Polignac number, because 828349991 - 2² = 828349987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828349993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108146 + ... + 115551.

It is an arithmetic number, because the mean of its divisors is an integer number (82469996).

Almost surely, 2^828349991 is an apocalyptic number.

828349991 is a deficient number, since it is larger than the sum of its proper divisors (161289961).

828349991 is a wasteful number, since it uses less digits than its factorization.

828349991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223750 (or 223727 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 53.

The square root of 828349991 is about 28781.0700113807. The cubic root of 828349991 is about 939.1564754320.

The spelling of 828349991 in words is "eight hundred twenty-eight million, three hundred forty-nine thousand, nine hundred ninety-one".