771066440 has 32 divisors (see below), whose sum is σ = 1735992000. Its totient is φ = 308232384.

The previous prime is 771066391. The next prime is 771066479. The reversal of 771066440 is 44660177.

It is a happy number.

771066440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 771066440.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70031 + ... + 80289.

It is an arithmetic number, because the mean of its divisors is an integer number (54249750).

Almost surely, 2^771066440 is an apocalyptic number.

It is an amenable number.

771066440 is an abundant number, since it is smaller than the sum of its proper divisors (964925560).

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

771066440 is a wasteful number, since it uses less digits than its factorization.

771066440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12149 (or 12145 counting only the distinct ones).

The product of its (nonzero) digits is 28224, while the sum is 35.

The square root of 771066440 is about 27768.0831171329. The cubic root of 771066440 is about 916.9885940721.

The spelling of 771066440 in words is "seven hundred seventy-one million, sixty-six thousand, four hundred forty".