7978376642 has 16 divisors (see below), whose sum is σ = 12146739264. Its totient is φ = 3929562000.

The previous prime is 7978376579. The next prime is 7978376669. The reversal of 7978376642 is 2466738797.

It is a super-2 number, since 2×7978376642² (a number of 21 digits) contains 22 as substring.

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, 142292 + ... + 190272.

It is an arithmetic number, because the mean of its divisors is an integer number (759171204).

Almost surely, 2^7978376642 is an apocalyptic number.

7978376642 is a deficient number, since it is larger than the sum of its proper divisors (4168362622).

7978376642 is a wasteful number, since it uses less digits than its factorization.

7978376642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49225.

The product of its digits is 21337344, while the sum is 59.

The square root of 7978376642 is about 89321.7590623920. The cubic root of 7978376642 is about 1998.1964275521.

The spelling of 7978376642 in words is "seven billion, nine hundred seventy-eight million, three hundred seventy-six thousand, six hundred forty-two".