77047681280 has 108 divisors (see below), whose sum is σ = 194779000332. Its totient is φ = 29196840960.

The previous prime is 77047681267. The next prime is 77047681289. The reversal of 77047681280 is 8218674077.

It can be written as a sum of positive squares in 2 ways, for example, as 40134512896 + 36913168384 = 200336^2 + 192128^2 .

It is not an unprimeable number, because it can be changed into a prime (77047681289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 378710 + ... + 545450.

Almost surely, 2^77047681280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77047681280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97389500166).

77047681280 is an abundant number, since it is smaller than the sum of its proper divisors (117731319052).

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

77047681280 is a wasteful number, since it uses less digits than its factorization.

77047681280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166800 (or 166767 counting only the distinct ones).

The product of its (nonzero) digits is 1053696, while the sum is 50.

The spelling of 77047681280 in words is "seventy-seven billion, forty-seven million, six hundred eighty-one thousand, two hundred eighty".