828661381 has 8 divisors (see below), whose sum is σ = 831459200. Its totient is φ = 825869520.

The previous prime is 828661367. The next prime is 828661387. The reversal of 828661381 is 183166828.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 828661381 - 2⁵ = 828661349 is a prime.

It is a super-2 number, since 2×828661381² = 1373359368721654322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (828661387) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 579175 + ... + 580603.

It is an arithmetic number, because the mean of its divisors is an integer number (103932400).

Almost surely, 2^828661381 is an apocalyptic number.

It is an amenable number.

828661381 is a deficient number, since it is larger than the sum of its proper divisors (2797819).

828661381 is a wasteful number, since it uses less digits than its factorization.

828661381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2979.

The product of its digits is 110592, while the sum is 43.

The square root of 828661381 is about 28786.4791351773. The cubic root of 828661381 is about 939.2741419984.

The spelling of 828661381 in words is "eight hundred twenty-eight million, six hundred sixty-one thousand, three hundred eighty-one".