1681428215 has 8 divisors (see below), whose sum is σ = 2018135088. Its totient is φ = 1344861760.

The previous prime is 1681428211. The next prime is 1681428239. The reversal of 1681428215 is 5128241861.

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

It is not a de Polignac number, because 1681428215 - 2² = 1681428211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1681428211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6662 + ... + 58371.

It is an arithmetic number, because the mean of its divisors is an integer number (252266886).

Almost surely, 2^1681428215 is an apocalyptic number.

1681428215 is a deficient number, since it is larger than the sum of its proper divisors (336706873).

1681428215 is an equidigital number, since it uses as much as digits as its factorization.

1681428215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70209.

The product of its digits is 30720, while the sum is 38.

The square root of 1681428215 is about 41005.2218016194. The cubic root of 1681428215 is about 1189.1211680920.

The spelling of 1681428215 in words is "one billion, six hundred eighty-one million, four hundred twenty-eight thousand, two hundred fifteen".