67698505728 has 768 divisors, whose sum is σ = 244992384000. Its totient is φ = 18059231232.

The previous prime is 67698505723. The next prime is 67698505729. The reversal of 67698505728 is 82750589676.

67698505728 is a `hidden beast` number, since 6 + 7 + 6 + 9 + 8 + 50 + 572 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (768).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67698505723) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 415328175 + ... + 415328337.

It is an arithmetic number, because the mean of its divisors is an integer number (319000500).

Almost surely, 2^67698505728 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 67698505728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122496192000).

67698505728 is an abundant number, since it is smaller than the sum of its proper divisors (177293878272).

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

67698505728 is a wasteful number, since it uses less digits than its factorization.

67698505728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 50803200, while the sum is 63.

The spelling of 67698505728 in words is "sixty-seven billion, six hundred ninety-eight million, five hundred five thousand, seven hundred twenty-eight".