1681887400 has 24 divisors (see below), whose sum is σ = 3910388670. Its totient is φ = 672754880.

The previous prime is 1681887373. The next prime is 1681887409. The reversal of 1681887400 is 47881861.

It can be written as a sum of positive squares in 3 ways, for example, as 1227941764 + 453945636 = 35042^2 + 21306^2 .

It is not an unprimeable number, because it can be changed into a prime (1681887409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4204519 + ... + 4204918.

Almost surely, 2^1681887400 is an apocalyptic number.

1681887400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1681887400 is an abundant number, since it is smaller than the sum of its proper divisors (2228501270).

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

1681887400 is a wasteful number, since it uses less digits than its factorization.

1681887400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8409453 (or 8409444 counting only the distinct ones).

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 1681887400 is about 41010.8205233692. The cubic root of 1681887400 is about 1189.2294048281.

The spelling of 1681887400 in words is "one billion, six hundred eighty-one million, eight hundred eighty-seven thousand, four hundred".