7978554972 has 24 divisors (see below), whose sum is σ = 20685142800. Its totient is φ = 2659518288.

The previous prime is 7978554967. The next prime is 7978555003. The reversal of 7978554972 is 2794558797.

7978554972 is a `hidden beast` number, since 7 + 9 + 7 + 8 + 554 + 9 + 72 = 666.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 36937647 + ... + 36937862.

It is an arithmetic number, because the mean of its divisors is an integer number (861880950).

Almost surely, 2^7978554972 is an apocalyptic number.

It is an amenable number.

7978554972 is an abundant number, since it is smaller than the sum of its proper divisors (12706587828).

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

7978554972 is a wasteful number, since it uses less digits than its factorization.

7978554972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73875522 (or 73875514 counting only the distinct ones).

The product of its digits is 44452800, while the sum is 63.

The square root of 7978554972 is about 89322.7573018209. The cubic root of 7978554972 is about 1998.2113151134.

The spelling of 7978554972 in words is "seven billion, nine hundred seventy-eight million, five hundred fifty-four thousand, nine hundred seventy-two".