771320140 has 24 divisors (see below), whose sum is σ = 1632142512. Its totient is φ = 306171840.

The previous prime is 771320131. The next prime is 771320153. The reversal of 771320140 is 41023177.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 144579 + ... + 149818.

It is an arithmetic number, because the mean of its divisors is an integer number (68005938).

Almost surely, 2^771320140 is an apocalyptic number.

It is an amenable number.

771320140 is an abundant number, since it is smaller than the sum of its proper divisors (860822372).

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

771320140 is a wasteful number, since it uses less digits than its factorization.

771320140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 294537 (or 294535 counting only the distinct ones).

The product of its (nonzero) digits is 1176, while the sum is 25.

The square root of 771320140 is about 27772.6509357677. The cubic root of 771320140 is about 917.0891537144.

The spelling of 771320140 in words is "seven hundred seventy-one million, three hundred twenty thousand, one hundred forty".