7771648 has 40 divisors (see below), whose sum is σ = 15934248. Its totient is φ = 3784704.

The previous prime is 7771639. The next prime is 7771649. The reversal of 7771648 is 8461777.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 7771648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7771649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21840 + ... + 22192.

Almost surely, 2^7771648 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 7771648, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7967124).

7771648 is an abundant number, since it is smaller than the sum of its proper divisors (8162600).

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

7771648 is an equidigital number, since it uses as much as digits as its factorization.

7771648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 414 (or 398 counting only the distinct ones).

The product of its digits is 65856, while the sum is 40.

The square root of 7771648 is about 2787.7675656338. The cubic root of 7771648 is about 198.0786681923.

The spelling of 7771648 in words is "seven million, seven hundred seventy-one thousand, six hundred forty-eight".