7578778464 has 72 divisors (see below), whose sum is σ = 21676872672. Its totient is φ = 2511640320.

The previous prime is 7578778457. The next prime is 7578778523. The reversal of 7578778464 is 4648778757.

It is a tau number, because it is divible by the number of its divisors (72).

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 11 ways as a sum of consecutive naturals, for example, 26232 + ... + 125879.

It is an arithmetic number, because the mean of its divisors is an integer number (301067676).

Almost surely, 2^7578778464 is an apocalyptic number.

It is an amenable number.

7578778464 is an abundant number, since it is smaller than the sum of its proper divisors (14098094208).

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

7578778464 is a wasteful number, since it uses less digits than its factorization.

7578778464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152300 (or 152289 counting only the distinct ones).

The product of its digits is 73758720, while the sum is 63.

The square root of 7578778464 is about 87056.1799299740. The cubic root of 7578778464 is about 1964.2634583930.

The spelling of 7578778464 in words is "seven billion, five hundred seventy-eight million, seven hundred seventy-eight thousand, four hundred sixty-four".