76720882981 has 8 divisors (see below), whose sum is σ = 79637314680. Its totient is φ = 73822510272.

The previous prime is 76720882967. The next prime is 76720883059. The reversal of 76720882981 is 18928802767.

It can be written as a sum of positive squares in 4 ways, for example, as 27343598881 + 49377284100 = 165359^2 + 222210^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 76720882981 - 2¹¹ = 76720880933 is a prime.

It is a super-6 number, since 6×76720882981⁶ (a number of 67 digits) contains 666666 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (76720882951) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4506090 + ... + 4523083.

It is an arithmetic number, because the mean of its divisors is an integer number (9954664335).

Almost surely, 2^76720882981 is an apocalyptic number.

It is an amenable number.

76720882981 is a deficient number, since it is larger than the sum of its proper divisors (2916431699).

76720882981 is a wasteful number, since it uses less digits than its factorization.

76720882981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9029495.

The product of its (nonzero) digits is 5419008, while the sum is 58.

The spelling of 76720882981 in words is "seventy-six billion, seven hundred twenty million, eight hundred eighty-two thousand, nine hundred eighty-one".