729666928 has 40 divisors (see below), whose sum is σ = 1510684560. Its totient is φ = 340208640.

The previous prime is 729666913. The next prime is 729666961. The reversal of 729666928 is 829666927.

It is a happy number.

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, 17343 + ... + 41953.

It is an arithmetic number, because the mean of its divisors is an integer number (37767114).

Almost surely, 2^729666928 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 729666928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755342280).

729666928 is an abundant number, since it is smaller than the sum of its proper divisors (781017632).

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

729666928 is a wasteful number, since it uses less digits than its factorization.

729666928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24745 (or 24739 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 55.

The square root of 729666928 is about 27012.3476950820. The cubic root of 729666928 is about 900.2743723139.

Subtracting 729666928 from its reverse (829666927), we obtain a palindrome (99999999).

The spelling of 729666928 in words is "seven hundred twenty-nine million, six hundred sixty-six thousand, nine hundred twenty-eight".