67128820 has 24 divisors (see below), whose sum is σ = 153786528. Its totient is φ = 24410400.

The previous prime is 67128811. The next prime is 67128833. The reversal of 67128820 is 2882176.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152346 + ... + 152785.

It is an arithmetic number, because the mean of its divisors is an integer number (6407772).

Almost surely, 2^67128820 is an apocalyptic number.

It is an amenable number.

67128820 is an abundant number, since it is smaller than the sum of its proper divisors (86657708).

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

67128820 is a wasteful number, since it uses less digits than its factorization.

67128820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305151 (or 305149 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 34.

The square root of 67128820 is about 8193.2179270419. The cubic root of 67128820 is about 406.4149461948.

The spelling of 67128820 in words is "sixty-seven million, one hundred twenty-eight thousand, eight hundred twenty".