7978794504976 has 45 divisors (see below), whose sum is σ = 16160790323559. Its totient is φ = 3815820912288.

The previous prime is 7978794504949. The next prime is 7978794505009. The reversal of 7978794504976 is 6794054978797.

The square root of 7978794504976 is 2824676.

It is a perfect power (a square), and thus also a powerful number.

It is a super-2 number, since 2×7978794504976² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7978794504976.

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 8 ways as a sum of consecutive naturals, for example, 259854841 + ... + 259885543.

Almost surely, 2^{7978794504976} is an apocalyptic number.

7978794504976 is the 2824676-th square number.

It is an amenable number.

7978794504976 is an abundant number, since it is smaller than the sum of its proper divisors (8181995818583).

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

7978794504976 is an frugal number, since it uses more digits than its factorization.

7978794504976 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61460 (or 30728 counting only the distinct ones).

The product of its (nonzero) digits is 6721263360, while the sum is 82.

The spelling of 7978794504976 in words is "seven trillion, nine hundred seventy-eight billion, seven hundred ninety-four million, five hundred four thousand, nine hundred seventy-six".