1681727540 has 24 divisors (see below), whose sum is σ = 3532425120. Its totient is φ = 672539168.

The previous prime is 1681727527. The next prime is 1681727581. The reversal of 1681727540 is 457271861.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134891 + ... + 146829.

It is an arithmetic number, because the mean of its divisors is an integer number (147184380).

Almost surely, 2^1681727540 is an apocalyptic number.

1681727540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681727540 is an abundant number, since it is smaller than the sum of its proper divisors (1850697580).

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

1681727540 is a wasteful number, since it uses less digits than its factorization.

1681727540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18991 (or 18989 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 41.

The square root of 1681727540 is about 41008.8714792300. The cubic root of 1681727540 is about 1189.1917256834.

The spelling of 1681727540 in words is "one billion, six hundred eighty-one million, seven hundred twenty-seven thousand, five hundred forty".