771980 has 48 divisors (see below), whose sum is σ = 1844640. Its totient is φ = 271040.

The previous prime is 771973. The next prime is 771997. The reversal of 771980 is 89177.

771980 = T₈₆ + T₈₇ + ... + T₁₇₃.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26606 + ... + 26634.

It is an arithmetic number, because the mean of its divisors is an integer number (38430).

2⁷⁷¹⁹⁸⁰ 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 771980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (922320).

771980 is an abundant number, since it is smaller than the sum of its proper divisors (1072660).

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

771980 is a wasteful number, since it uses less digits than its factorization.

771980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71 (or 47 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 771980 is about 878.6239240995. The cubic root of 771980 is about 91.7350600694.

The spelling of 771980 in words is "seven hundred seventy-one thousand, nine hundred eighty".