77387807752 has 8 divisors (see below), whose sum is σ = 145102139550. Its totient is φ = 38693903872.

The previous prime is 77387807741. The next prime is 77387807753. The reversal of 77387807752 is 25770878377.

It can be written as a sum of positive squares in only one way, i.e., 47622587076 + 29765220676 = 218226^2 + 172526^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×77387807752² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77387807753) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4836737977 + ... + 4836737992.

Almost surely, 2^77387807752 is an apocalyptic number.

It is an amenable number.

77387807752 is a deficient number, since it is larger than the sum of its proper divisors (67714331798).

77387807752 is a wasteful number, since it uses less digits than its factorization.

77387807752 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9673475975 (or 9673475971 counting only the distinct ones).

The product of its (nonzero) digits is 32269440, while the sum is 61.

The spelling of 77387807752 in words is "seventy-seven billion, three hundred eighty-seven million, eight hundred seven thousand, seven hundred fifty-two".