67787129728 has 48 divisors (see below), whose sum is σ = 139862183760. Its totient is φ = 32724769280.

The previous prime is 67787129717. The next prime is 67787129741. The reversal of 67787129728 is 82792178776.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a self number, because there is not a number n which added to its sum of digits gives 67787129728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 207208 + ... + 422503.

It is an arithmetic number, because the mean of its divisors is an integer number (2913795495).

Almost surely, 2^67787129728 is an apocalyptic number.

It is an amenable number.

67787129728 is an abundant number, since it is smaller than the sum of its proper divisors (72075054032).

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

67787129728 is an equidigital number, since it uses as much as digits as its factorization.

67787129728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 629783 (or 629742 counting only the distinct ones).

The product of its digits is 33191424, while the sum is 64.

The spelling of 67787129728 in words is "sixty-seven billion, seven hundred eighty-seven million, one hundred twenty-nine thousand, seven hundred twenty-eight".