72228785 has 16 divisors (see below), whose sum is σ = 91445760. Its totient is φ = 54616320.

The previous prime is 72228769. The next prime is 72228787. The reversal of 72228785 is 58782227.

It is a happy number.

It is not a de Polignac number, because 72228785 - 2⁴ = 72228769 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72228787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 81545 + ... + 82425.

It is an arithmetic number, because the mean of its divisors is an integer number (5715360).

Almost surely, 2^72228785 is an apocalyptic number.

It is an amenable number.

72228785 is a deficient number, since it is larger than the sum of its proper divisors (19216975).

72228785 is a wasteful number, since it uses less digits than its factorization.

72228785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1768.

The product of its digits is 125440, while the sum is 41.

The square root of 72228785 is about 8498.7519672008. The cubic root of 72228785 is about 416.4569394303.

The spelling of 72228785 in words is "seventy-two million, two hundred twenty-eight thousand, seven hundred eighty-five".