7978071215 has 16 divisors (see below), whose sum is σ = 10080628320. Its totient is φ = 6044699520.

The previous prime is 7978071193. The next prime is 7978071281. The reversal of 7978071215 is 5121708797.

It is not a de Polignac number, because 7978071215 - 2²⁶ = 7910962351 is a prime.

It is a super-2 number, since 2×7978071215² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 7978071215.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 357485 + ... + 379145.

It is an arithmetic number, because the mean of its divisors is an integer number (630039270).

Almost surely, 2^7978071215 is an apocalyptic number.

7978071215 is a deficient number, since it is larger than the sum of its proper divisors (2102557105).

7978071215 is a wasteful number, since it uses less digits than its factorization.

7978071215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25562.

The product of its (nonzero) digits is 246960, while the sum is 47.

The square root of 7978071215 is about 89320.0493450379. The cubic root of 7978071215 is about 1998.1709290096.

The spelling of 7978071215 in words is "seven billion, nine hundred seventy-eight million, seventy-one thousand, two hundred fifteen".