1687055478 has 16 divisors (see below), whose sum is σ = 3465303600. Its totient is φ = 547153056.

The previous prime is 1687055449. The next prime is 1687055519. The reversal of 1687055478 is 8745507861.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 1687055478.

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, 3799453 + ... + 3799896.

It is an arithmetic number, because the mean of its divisors is an integer number (216581475).

Almost surely, 2^1687055478 is an apocalyptic number.

1687055478 is an abundant number, since it is smaller than the sum of its proper divisors (1778248122).

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

1687055478 is a wasteful number, since it uses less digits than its factorization.

1687055478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7599391.

The product of its (nonzero) digits is 1881600, while the sum is 51.

The square root of 1687055478 is about 41073.7809070458. The cubic root of 1687055478 is about 1190.4462413230.

It can be divided in two parts, 168 and 7055478, that added together give a triangular number (7055646 = T₃₇₅₆).

The spelling of 1687055478 in words is "one billion, six hundred eighty-seven million, fifty-five thousand, four hundred seventy-eight".