771206540 has 48 divisors (see below), whose sum is σ = 1791273792. Its totient is φ = 277053696.

The previous prime is 771206539. The next prime is 771206543. The reversal of 771206540 is 45602177.

It is a junction number, because it is equal to n+sod(n) for n = 771206497 and 771206506.

It is not an unprimeable number, because it can be changed into a prime (771206543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30464 + ... + 49703.

It is an arithmetic number, because the mean of its divisors is an integer number (37318204).

Almost surely, 2^771206540 is an apocalyptic number.

It is an amenable number.

771206540 is an abundant number, since it is smaller than the sum of its proper divisors (1020067252).

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

771206540 is a wasteful number, since it uses less digits than its factorization.

771206540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80226 (or 80224 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 771206540 is about 27770.6056829879. The cubic root of 771206540 is about 917.0441285524.

The spelling of 771206540 in words is "seven hundred seventy-one million, two hundred six thousand, five hundred forty".