771743642 has 4 divisors (see below), whose sum is σ = 1157615466. Its totient is φ = 385871820.

The previous prime is 771743641. The next prime is 771743647. The reversal of 771743642 is 246347177.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 749171641 + 22572001 = 27371^2 + 4751^2 .

It is a super-3 number, since 3×771743642³ (a number of 28 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 771743642.

It is not an unprimeable number, because it can be changed into a prime (771743641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 192935909 + ... + 192935912.

Almost surely, 2^771743642 is an apocalyptic number.

771743642 is a deficient number, since it is larger than the sum of its proper divisors (385871824).

771743642 is a wasteful number, since it uses less digits than its factorization.

771743642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 385871823.

The product of its digits is 197568, while the sum is 41.

The square root of 771743642 is about 27780.2743326987. The cubic root of 771743642 is about 917.2569690435.

The spelling of 771743642 in words is "seven hundred seventy-one million, seven hundred forty-three thousand, six hundred forty-two".