1687744740 has 96 divisors (see below), whose sum is σ = 5232374784. Its totient is φ = 403032960.

The previous prime is 1687744739. The next prime is 1687744757. The reversal of 1687744740 is 474477861.

It is a self number, because there is not a number n which added to its sum of digits gives 1687744740.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 25137 + ... + 63303.

It is an arithmetic number, because the mean of its divisors is an integer number (54503904).

Almost surely, 2^1687744740 is an apocalyptic number.

1687744740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1687744740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2616187392).

1687744740 is an abundant number, since it is smaller than the sum of its proper divisors (3544630044).

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

1687744740 is a wasteful number, since it uses less digits than its factorization.

1687744740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38257 (or 38255 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 48.

The square root of 1687744740 is about 41082.1705853038. The cubic root of 1687744740 is about 1190.6083418285.

The spelling of 1687744740 in words is "one billion, six hundred eighty-seven million, seven hundred forty-four thousand, seven hundred forty".