72206765 has 4 divisors (see below), whose sum is σ = 86648124. Its totient is φ = 57765408.

The previous prime is 72206759. The next prime is 72206777. The reversal of 72206765 is 56760227.

It is a happy number.

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 15264649 + 56942116 = 3907^2 + 7546^2 .

It is a cyclic number.

It is not a de Polignac number, because 72206765 - 2¹⁰ = 72205741 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7220672 + ... + 7220681.

It is an arithmetic number, because the mean of its divisors is an integer number (21662031).

Almost surely, 2^72206765 is an apocalyptic number.

It is an amenable number.

72206765 is a deficient number, since it is larger than the sum of its proper divisors (14441359).

72206765 is a wasteful number, since it uses less digits than its factorization.

72206765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14441358.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 72206765 is about 8497.4563841187. The cubic root of 72206765 is about 416.4146141354.

The spelling of 72206765 in words is "seventy-two million, two hundred six thousand, seven hundred sixty-five".