72705773 has 4 divisors (see below), whose sum is σ = 83092320. Its totient is φ = 62319228.

The previous prime is 72705769. The next prime is 72705779. The reversal of 72705773 is 37750727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72705773 - 2² = 72705769 is a prime.

It is a super-2 number, since 2×72705773² = 10572258855055058, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72705779) 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, 5193263 + ... + 5193276.

It is an arithmetic number, because the mean of its divisors is an integer number (20773080).

Almost surely, 2^72705773 is an apocalyptic number.

It is an amenable number.

72705773 is a deficient number, since it is larger than the sum of its proper divisors (10386547).

72705773 is a wasteful number, since it uses less digits than its factorization.

72705773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10386546.

The product of its (nonzero) digits is 72030, while the sum is 38.

The square root of 72705773 is about 8526.7680278051. The cubic root of 72705773 is about 417.3716683991.

The spelling of 72705773 in words is "seventy-two million, seven hundred five thousand, seven hundred seventy-three".