828567981 has 32 divisors (see below), whose sum is σ = 1303274880. Its totient is φ = 518462208.

The previous prime is 828567977. The next prime is 828567997. The reversal of 828567981 is 189765828.

It is not a de Polignac number, because 828567981 - 2² = 828567977 is a prime.

It is a super-2 number, since 2×828567981² = 1373049798276832722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828567281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179950 + ... + 184496.

It is an arithmetic number, because the mean of its divisors is an integer number (40727340).

Almost surely, 2^828567981 is an apocalyptic number.

It is an amenable number.

828567981 is a deficient number, since it is larger than the sum of its proper divisors (474706899).

828567981 is a wasteful number, since it uses less digits than its factorization.

828567981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4970 (or 4964 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 828567981 is about 28784.8568000607. The cubic root of 828567981 is about 939.2388515477.

The spelling of 828567981 in words is "eight hundred twenty-eight million, five hundred sixty-seven thousand, nine hundred eighty-one".