1681632426 has 16 divisors (see below), whose sum is σ = 3396565728. Its totient is φ = 554994000.

The previous prime is 1681632413. The next prime is 1681632427. The reversal of 1681632426 is 6242361861.

It is not an unprimeable number, because it can be changed into a prime (1681632427) 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, 1386880 + ... + 1388091.

It is an arithmetic number, because the mean of its divisors is an integer number (212285358).

Almost surely, 2^1681632426 is an apocalyptic number.

1681632426 is an abundant number, since it is smaller than the sum of its proper divisors (1714933302).

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

1681632426 is a wasteful number, since it uses less digits than its factorization.

1681632426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2775077.

The product of its digits is 82944, while the sum is 39.

The square root of 1681632426 is about 41007.7117869310. The cubic root of 1681632426 is about 1189.1693060957.

The spelling of 1681632426 in words is "one billion, six hundred eighty-one million, six hundred thirty-two thousand, four hundred twenty-six".