1681404828 has 12 divisors (see below), whose sum is σ = 3923277960. Its totient is φ = 560468272.

The previous prime is 1681404797. The next prime is 1681404847. The reversal of 1681404828 is 8284041861.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 1681404828.

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, 70058523 + ... + 70058546.

It is an arithmetic number, because the mean of its divisors is an integer number (326939830).

Almost surely, 2^1681404828 is an apocalyptic number.

It is an amenable number.

1681404828 is an abundant number, since it is smaller than the sum of its proper divisors (2241873132).

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

1681404828 is a wasteful number, since it uses less digits than its factorization.

1681404828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140117076 (or 140117074 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 42.

The square root of 1681404828 is about 41004.9366296303. The cubic root of 1681404828 is about 1189.1156549008.

The spelling of 1681404828 in words is "one billion, six hundred eighty-one million, four hundred four thousand, eight hundred twenty-eight".