3687811878 has 32 divisors (see below), whose sum is σ = 7797772800. Its totient is φ = 1159478496.

The previous prime is 3687811849. The next prime is 3687811909. The reversal of 3687811878 is 8781187863.

It is a Harshad number since it is a multiple of its sum of digits (57).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44526 + ... + 96737.

It is an arithmetic number, because the mean of its divisors is an integer number (243680400).

Almost surely, 2^3687811878 is an apocalyptic number.

3687811878 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

3687811878 is an abundant number, since it is smaller than the sum of its proper divisors (4109960922).

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

3687811878 is a wasteful number, since it uses less digits than its factorization.

3687811878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 141516.

The product of its digits is 3612672, while the sum is 57.

The square root of 3687811878 is about 60727.3569159732. The cubic root of 3687811878 is about 1544.9802056512.

The spelling of 3687811878 in words is "three billion, six hundred eighty-seven million, eight hundred eleven thousand, eight hundred seventy-eight".