912781728868464 has 1200 divisors, whose sum is σ = 3531492262008480. Its totient is φ = 224939012014080.

The previous prime is 912781728868439. The next prime is 912781728868469. The reversal of 912781728868464 is 464868827187219.

912781728868464 is a `hidden beast` number, since 9 + 1 + 2 + 7 + 8 + 1 + 72 + 8 + 86 + 8 + 464 = 666.

It is a super-2 number, since 2×912781728868464² (a number of 31 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (81).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (912781728868469) by changing a digit.

It is a polite number, since it can be written in 239 ways as a sum of consecutive naturals, for example, 1144642044 + ... + 1145439204.

Almost surely, 2^{912781728868464} 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 912781728868464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1765746131004240).

912781728868464 is an abundant number, since it is smaller than the sum of its proper divisors (2618710533140016).

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

912781728868464 is a wasteful number, since it uses less digits than its factorization.

912781728868464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797300 (or 797278 counting only the distinct ones).

The product of its digits is 4161798144, while the sum is 81.

The spelling of 912781728868464 in words is "nine hundred twelve trillion, seven hundred eighty-one billion, seven hundred twenty-eight million, eight hundred sixty-eight thousand, four hundred sixty-four".