76138721770 has 16 divisors (see below), whose sum is σ = 137054128680. Its totient is φ = 30454504384.

The previous prime is 76138721759. The next prime is 76138721779. The reversal of 76138721770 is 7712783167.

It can be written as a sum of positive squares in 4 ways, for example, as 63543822241 + 12594899529 = 252079^2 + 112227^2 .

It is not an unprimeable number, because it can be changed into a prime (76138721779) 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 7 ways as a sum of consecutive naturals, for example, 258036 + ... + 467824.

Almost surely, 2^76138721770 is an apocalyptic number.

76138721770 is a deficient number, since it is larger than the sum of its proper divisors (60915406910).

76138721770 is a wasteful number, since it uses less digits than its factorization.

76138721770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246089.

The product of its (nonzero) digits is 691488, while the sum is 49.

The spelling of 76138721770 in words is "seventy-six billion, one hundred thirty-eight million, seven hundred twenty-one thousand, seven hundred seventy".