776720 has 80 divisors (see below), whose sum is σ = 2202240. Its totient is φ = 248832.

The previous prime is 776719. The next prime is 776729. The reversal of 776720 is 27677.

776720 = T₅₅ + T₅₆ + ... + T₁₆₈.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (776729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10604 + ... + 10676.

It is an arithmetic number, because the mean of its divisors is an integer number (27528).

2⁷⁷⁶⁷²⁰ is an apocalyptic number.

776720 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 776720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1101120).

776720 is an abundant number, since it is smaller than the sum of its proper divisors (1425520).

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

776720 is a wasteful number, since it uses less digits than its factorization.

776720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112 (or 106 counting only the distinct ones).

The product of its (nonzero) digits is 4116, while the sum is 29.

The square root of 776720 is about 881.3171960197. The cubic root of 776720 is about 91.9224298890.

The spelling of 776720 in words is "seven hundred seventy-six thousand, seven hundred twenty".