727785724428 has 144 divisors (see below), whose sum is σ = 2272964977920. Its totient is φ = 191670406272.

The previous prime is 727785724403. The next prime is 727785724441. The reversal of 727785724428 is 824427587727.

727785724428 is a `hidden beast` number, since 72 + 7 + 78 + 5 + 72 + 4 + 428 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1876926 + ... + 2231237.

Almost surely, 2^727785724428 is an apocalyptic number.

It is an amenable number.

727785724428 is an abundant number, since it is smaller than the sum of its proper divisors (1545179253492).

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

727785724428 is a wasteful number, since it uses less digits than its factorization.

727785724428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108236 (or 4108231 counting only the distinct ones).

The product of its digits is 98344960, while the sum is 63.

The spelling of 727785724428 in words is "seven hundred twenty-seven billion, seven hundred eighty-five million, seven hundred twenty-four thousand, four hundred twenty-eight".