1687692740 has 12 divisors (see below), whose sum is σ = 3544154796. Its totient is φ = 675077088.

The previous prime is 1687692739. The next prime is 1687692749. The reversal of 1687692740 is 472967861.

It can be written as a sum of positive squares in 2 ways, for example, as 348718276 + 1338974464 = 18674^2 + 36592^2 .

It is a hoax number, since the sum of its digits (50) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1687692749) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42192299 + ... + 42192338.

It is an arithmetic number, because the mean of its divisors is an integer number (295346233).

Almost surely, 2^1687692740 is an apocalyptic number.

1687692740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1687692740 is an abundant number, since it is smaller than the sum of its proper divisors (1856462056).

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

1687692740 is a wasteful number, since it uses less digits than its factorization.

1687692740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84384646 (or 84384644 counting only the distinct ones).

The product of its (nonzero) digits is 1016064, while the sum is 50.

The square root of 1687692740 is about 41081.5377024765. The cubic root of 1687692740 is about 1190.5961140178.

The spelling of 1687692740 in words is "one billion, six hundred eighty-seven million, six hundred ninety-two thousand, seven hundred forty".