7775664 has 80 divisors (see below), whose sum is σ = 22936032. Its totient is φ = 2248704.

The previous prime is 7775657. The next prime is 7775701. The reversal of 7775664 is 4665777.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10242 + ... + 10974.

Almost surely, 2^7775664 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 7775664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (11468016).

7775664 is an abundant number, since it is smaller than the sum of its proper divisors (15160368).

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

7775664 is a wasteful number, since it uses less digits than its factorization.

7775664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 768 counting only the distinct ones).

The product of its digits is 246960, while the sum is 42.

The square root of 7775664 is about 2788.4877622109. The cubic root of 7775664 is about 198.1127813752.

It can be divided in two parts, 777 and 5664, that added together give a triangular number (6441 = T₁₁₃).

The spelling of 7775664 in words is "seven million, seven hundred seventy-five thousand, six hundred sixty-four".