77485403044 has 81 divisors (see below), whose sum is σ = 160934530113. Its totient is φ = 32548311936.

The previous prime is 77485403027. The next prime is 77485403057. The reversal of 77485403044 is 44030458477.

The square root of 77485403044 is 278362.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 20894702500 + 56590700544 = 144550^2 + 237888^2 .

It is a super-2 number, since 2×77485403044² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 77485402985 and 77485403003.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 229926844 + ... + 229927180.

Almost surely, 2^77485403044 is an apocalyptic number.

77485403044 is the 278362-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 77485403044

77485403044 is an abundant number, since it is smaller than the sum of its proper divisors (83449127069).

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

77485403044 is an equidigital number, since it uses as much as digits as its factorization.

77485403044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810 (or 405 counting only the distinct ones).

The product of its (nonzero) digits is 1505280, while the sum is 46.

The spelling of 77485403044 in words is "seventy-seven billion, four hundred eighty-five million, four hundred three thousand, forty-four".