7771472646 has 128 divisors (see below), whose sum is σ = 18927845376. Its totient is φ = 2080391040.

The previous prime is 7771472641. The next prime is 7771472647. The reversal of 7771472646 is 6462741777.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771472641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7109676 + ... + 7110768.

It is an arithmetic number, because the mean of its divisors is an integer number (147873792).

Almost surely, 2^7771472646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7771472646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (9463922688).

7771472646 is an abundant number, since it is smaller than the sum of its proper divisors (11156372730).

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

7771472646 is a wasteful number, since it uses less digits than its factorization.

7771472646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1306.

The product of its digits is 2765952, while the sum is 51.

The square root of 7771472646 is about 88155.9563841264. The cubic root of 7771472646 is about 1980.7717841185.

The spelling of 7771472646 in words is "seven billion, seven hundred seventy-one million, four hundred seventy-two thousand, six hundred forty-six".