1681447604 has 12 divisors (see below), whose sum is σ = 2945008164. Its totient is φ = 840016704.

The previous prime is 1681447589. The next prime is 1681447633. The reversal of 1681447604 is 4067441861.

It can be written as a sum of positive squares in 2 ways, for example, as 952339600 + 729108004 = 30860^2 + 27002^2 .

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171407 + ... + 180950.

It is an arithmetic number, because the mean of its divisors is an integer number (245417347).

Almost surely, 2^1681447604 is an apocalyptic number.

It is an amenable number.

1681447604 is a deficient number, since it is larger than the sum of its proper divisors (1263560560).

1681447604 is a wasteful number, since it uses less digits than its factorization.

1681447604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353554 (or 353552 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 1681447604 is about 41005.4582220465. The cubic root of 1681447604 is about 1189.1257387662.

The spelling of 1681447604 in words is "one billion, six hundred eighty-one million, four hundred forty-seven thousand, six hundred four".