776664 has 96 divisors (see below), whose sum is σ = 2545920. Its totient is φ = 209088.

The previous prime is 776651. The next prime is 776683. The reversal of 776664 is 466677.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nude number because it is divisible by every one of its digits.

It is a nialpdrome in base 10.

It is a congruent number.

It is an unprimeable number.

776664 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11559 + ... + 11625.

It is an arithmetic number, because the mean of its divisors is an integer number (26520).

2⁷⁷⁶⁶⁶⁴ 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 776664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1272960).

776664 is an abundant number, since it is smaller than the sum of its proper divisors (1769256).

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

776664 is a wasteful number, since it uses less digits than its factorization.

776664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 109 (or 102 counting only the distinct ones).

The product of its digits is 42336, while the sum is 36.

The square root of 776664 is about 881.2854248199. The cubic root of 776664 is about 91.9202206931.

The spelling of 776664 in words is "seven hundred seventy-six thousand, six hundred sixty-four".