1641704328 has 64 divisors (see below), whose sum is σ = 4974868800. Its totient is φ = 497485440.

The previous prime is 1641704321. The next prime is 1641704333. The reversal of 1641704328 is 8234071461.

1641704328 is a `hidden beast` number, since 1 + 641 + 7 + 0 + 4 + 3 + 2 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 1641704292 and 1641704301.

It is not an unprimeable number, because it can be changed into a prime (1641704321) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 343101 + ... + 347852.

It is an arithmetic number, because the mean of its divisors is an integer number (77732325).

Almost surely, 2^1641704328 is an apocalyptic number.

1641704328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1641704328 is an abundant number, since it is smaller than the sum of its proper divisors (3333164472).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1641704328 is a wasteful number, since it uses less digits than its factorization.

1641704328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 690979 (or 690969 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 36.

The square root of 1641704328 is about 40517.9506885528. The cubic root of 1641704328 is about 1179.6820765646.

Adding to 1641704328 its reverse (8234071461), we get a palindrome (9875775789).

The spelling of 1641704328 in words is "one billion, six hundred forty-one million, seven hundred four thousand, three hundred twenty-eight".