72729668 has 12 divisors (see below), whose sum is σ = 138847632. Its totient is φ = 33058920.

The previous prime is 72729661. The next prime is 72729673. The reversal of 72729668 is 86692727.

It is not an unprimeable number, because it can be changed into a prime (72729661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 826430 + ... + 826517.

It is an arithmetic number, because the mean of its divisors is an integer number (11570636).

Almost surely, 2^72729668 is an apocalyptic number.

It is an amenable number.

72729668 is a deficient number, since it is larger than the sum of its proper divisors (66117964).

72729668 is a wasteful number, since it uses less digits than its factorization.

72729668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1652962 (or 1652960 counting only the distinct ones).

The product of its digits is 508032, while the sum is 47.

The square root of 72729668 is about 8528.1690883800. The cubic root of 72729668 is about 417.4173869312.

The spelling of 72729668 in words is "seventy-two million, seven hundred twenty-nine thousand, six hundred sixty-eight".