77814781148 has 36 divisors (see below), whose sum is σ = 149657641560. Its totient is φ = 35378456256.

The previous prime is 77814781147. The next prime is 77814781157. The reversal of 77814781148 is 84118741877.

It is a super-2 number, since 2×77814781148² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77814781093 and 77814781102.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77814781147) 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, 813743 + ... + 904326.

It is an arithmetic number, because the mean of its divisors is an integer number (4157156710).

Almost surely, 2^77814781148 is an apocalyptic number.

It is an amenable number.

77814781148 is a deficient number, since it is larger than the sum of its proper divisors (71842860412).

77814781148 is a wasteful number, since it uses less digits than its factorization.

77814781148 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1718166 (or 1718151 counting only the distinct ones).

The product of its digits is 2809856, while the sum is 56.

The spelling of 77814781148 in words is "seventy-seven billion, eight hundred fourteen million, seven hundred eighty-one thousand, one hundred forty-eight".