72729893 has 4 divisors (see below), whose sum is σ = 77008140. Its totient is φ = 68451648.

The previous prime is 72729869. The next prime is 72729959. The reversal of 72729893 is 39892727.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55606849 + 17123044 = 7457^2 + 4138^2 .

It is a cyclic number.

It is not a de Polignac number, because 72729893 - 2¹⁶ = 72664357 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72729493) 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, 2139098 + ... + 2139131.

It is an arithmetic number, because the mean of its divisors is an integer number (19252035).

Almost surely, 2^72729893 is an apocalyptic number.

It is an amenable number.

72729893 is a deficient number, since it is larger than the sum of its proper divisors (4278247).

72729893 is a wasteful number, since it uses less digits than its factorization.

72729893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4278246.

The product of its digits is 381024, while the sum is 47.

The square root of 72729893 is about 8528.1822799469. The cubic root of 72729893 is about 417.4178173783.

The spelling of 72729893 in words is "seventy-two million, seven hundred twenty-nine thousand, eight hundred ninety-three".