77481969433290 has 48 divisors (see below), whose sum is σ = 201560677356168. Its totient is φ = 20650827045888.

The previous prime is 77481969433289. The next prime is 77481969433291. The reversal of 77481969433290 is 9233496918477.

It is a happy number.

77481969433290 is a `hidden beast` number, since 7 + 7 + 4 + 81 + 96 + 9 + 433 + 29 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (77481969433289) and next prime (77481969433291).

It can be written as a sum of positive squares in 4 ways, for example, as 61201785446649 + 16280183986641 = 7823157^2 + 4034871^2 .

It is a super-2 number, since 2×77481969433290² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (77481969433291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 229652779 + ... + 229989918.

Almost surely, 2^{77481969433290} is an apocalyptic number.

77481969433290 is an abundant number, since it is smaller than the sum of its proper divisors (124078707922878).

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

77481969433290 is a wasteful number, since it uses less digits than its factorization.

77481969433290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459644583 (or 459644580 counting only the distinct ones).

The product of its (nonzero) digits is 493807104, while the sum is 72.

The spelling of 77481969433290 in words is "seventy-seven trillion, four hundred eighty-one billion, nine hundred sixty-nine million, four hundred thirty-three thousand, two hundred ninety".