771680 has 96 divisors (see below), whose sum is σ = 2286144. Its totient is φ = 239616.

The previous prime is 771679. The next prime is 771691. The reversal of 771680 is 86177.

771680 = T₃₂₅ + T₃₂₆ + ... + T₃₃₈.

It is an Ulam number.

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, 14534 + ... + 14586.

It is an arithmetic number, because the mean of its divisors is an integer number (23814).

2⁷⁷¹⁶⁸⁰ is an apocalyptic number.

771680 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 771680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1143072).

771680 is an abundant number, since it is smaller than the sum of its proper divisors (1514464).

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

771680 is a wasteful number, since it uses less digits than its factorization.

771680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88 (or 80 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 29.

The square root of 771680 is about 878.4531860037. The cubic root of 771680 is about 91.7231754421.

The spelling of 771680 in words is "seven hundred seventy-one thousand, six hundred eighty".