67429728 has 36 divisors (see below), whose sum is σ = 191754108. Its totient is φ = 22476480.

The previous prime is 67429723. The next prime is 67429729. The reversal of 67429728 is 82792476.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67429723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 116778 + ... + 117353.

It is an arithmetic number, because the mean of its divisors is an integer number (5326503).

Almost surely, 2^67429728 is an apocalyptic number.

It is an amenable number.

67429728 is an abundant number, since it is smaller than the sum of its proper divisors (124324380).

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

67429728 is a wasteful number, since it uses less digits than its factorization.

67429728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234147 (or 234136 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 67429728 is about 8211.5606312077. The cubic root of 67429728 is about 407.0212989435.

The spelling of 67429728 in words is "sixty-seven million, four hundred twenty-nine thousand, seven hundred twenty-eight".