771777940 has 24 divisors (see below), whose sum is σ = 1621536840. Its totient is φ = 308558208.

The previous prime is 771777913. The next prime is 771777943. The reversal of 771777940 is 49777177.

It can be written as a sum of positive squares in 4 ways, for example, as 9024016 + 762753924 = 3004^2 + 27618^2 .

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (771777943) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 37446 + ... + 54274.

It is an arithmetic number, because the mean of its divisors is an integer number (67564035).

Almost surely, 2^771777940 is an apocalyptic number.

It is an amenable number.

771777940 is an abundant number, since it is smaller than the sum of its proper divisors (849758900).

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

771777940 is a wasteful number, since it uses less digits than its factorization.

771777940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19131 (or 19129 counting only the distinct ones).

The product of its (nonzero) digits is 605052, while the sum is 49.

The square root of 771777940 is about 27780.8916343590. The cubic root of 771777940 is about 917.2705571539.

The spelling of 771777940 in words is "seven hundred seventy-one million, seven hundred seventy-seven thousand, nine hundred forty".