3678521378 has 16 divisors (see below), whose sum is σ = 6308660160. Its totient is φ = 1575853296.

The previous prime is 3678521359. The next prime is 3678521381. The reversal of 3678521378 is 8731258763.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19001 + ... + 87852.

It is an arithmetic number, because the mean of its divisors is an integer number (394291260).

Almost surely, 2^3678521378 is an apocalyptic number.

3678521378 is a deficient number, since it is larger than the sum of its proper divisors (2630138782).

3678521378 is a wasteful number, since it uses less digits than its factorization.

3678521378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109321.

The product of its digits is 1693440, while the sum is 50.

The square root of 3678521378 is about 60650.8151470366. The cubic root of 3678521378 is about 1543.6817203149.

The spelling of 3678521378 in words is "three billion, six hundred seventy-eight million, five hundred twenty-one thousand, three hundred seventy-eight".