1681428294 has 448 divisors, whose sum is σ = 5288371200. Its totient is φ = 387991296.

The previous prime is 1681428289. The next prime is 1681428377. The reversal of 1681428294 is 4928241861.

It is a super-2 number, since 2×1681428294² = 5654402215727500872, which contains 22 as substring.

Its product of digits (221184) is a multiple of the sum of its prime divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 223 ways as a sum of consecutive naturals, for example, 57980272 + ... + 57980300.

It is an arithmetic number, because the mean of its divisors is an integer number (11804400).

Almost surely, 2^1681428294 is an apocalyptic number.

1681428294 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1681428294, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2644185600).

1681428294 is an abundant number, since it is smaller than the sum of its proper divisors (3606942906).

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

1681428294 is a wasteful number, since it uses less digits than its factorization.

1681428294 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 96 counting only the distinct ones).

The product of its digits is 221184, while the sum is 45.

The square root of 1681428294 is about 41005.2227649113. Note that the first 3 decimals coincide. The cubic root of 1681428294 is about 1189.1211867152.

The spelling of 1681428294 in words is "one billion, six hundred eighty-one million, four hundred twenty-eight thousand, two hundred ninety-four".