1687731480 has 48 divisors (see below), whose sum is σ = 5485128480. Its totient is φ = 450061632.

The previous prime is 1687731433. The next prime is 1687731497. The reversal of 1687731480 is 841377861.

1687731480 is a `hidden beast` number, since 168 + 7 + 7 + 3 + 1 + 480 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2343712 + ... + 2344431.

It is an arithmetic number, because the mean of its divisors is an integer number (114273510).

Almost surely, 2^1687731480 is an apocalyptic number.

1687731480 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687731480 is an abundant number, since it is smaller than the sum of its proper divisors (3797397000).

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

1687731480 is a wasteful number, since it uses less digits than its factorization.

1687731480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688160 (or 4688153 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 1687731480 is about 41082.0092011089. The cubic root of 1687731480 is about 1190.6052237606.

The spelling of 1687731480 in words is "one billion, six hundred eighty-seven million, seven hundred thirty-one thousand, four hundred eighty".