76687190820 has 36 divisors (see below), whose sum is σ = 232617812700. Its totient is φ = 20449917504.

The previous prime is 76687190813. The next prime is 76687190821. The reversal of 76687190820 is 2809178667.

It can be written as a sum of positive squares in 2 ways, for example, as 18367838784 + 58319352036 = 135528^2 + 241494^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (76687190821) 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 11 ways as a sum of consecutive naturals, for example, 213019795 + ... + 213020154.

Almost surely, 2^76687190820 is an apocalyptic number.

It is an amenable number.

76687190820 is an abundant number, since it is smaller than the sum of its proper divisors (155930621880).

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

76687190820 is a wasteful number, since it uses less digits than its factorization.

76687190820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426039964 (or 426039959 counting only the distinct ones).

The product of its (nonzero) digits is 2032128, while the sum is 54.

The spelling of 76687190820 in words is "seventy-six billion, six hundred eighty-seven million, one hundred ninety thousand, eight hundred twenty".