3878512642 has 16 divisors (see below), whose sum is σ = 5978549880. Its totient is φ = 1885724928.

The previous prime is 3878512639. The next prime is 3878512681. The reversal of 3878512642 is 2462158783.

It can be written as a sum of positive squares in 4 ways, for example, as 3707713881 + 170798761 = 60891^2 + 13069^2 .

It is a junction number, because it is equal to n+sod(n) for n = 3878512592 and 3878512601.

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, 117738 + ... + 147034.

Almost surely, 2^3878512642 is an apocalyptic number.

3878512642 is a deficient number, since it is larger than the sum of its proper divisors (2100037238).

3878512642 is a wasteful number, since it uses less digits than its factorization.

3878512642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31125.

The product of its digits is 645120, while the sum is 46.

The square root of 3878512642 is about 62277.7058183745. The cubic root of 3878512642 is about 1571.1647869728.

The spelling of 3878512642 in words is "three billion, eight hundred seventy-eight million, five hundred twelve thousand, six hundred forty-two".