72305285 has 8 divisors (see below), whose sum is σ = 93440760. Its totient is φ = 53394624.

The previous prime is 72305281. The next prime is 72305339. The reversal of 72305285 is 58250327.

It can be written as a sum of positive squares in 4 ways, for example, as 106276 + 72199009 = 326^2 + 8497^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72305285 - 2² = 72305281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72305281) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 556130 + ... + 556259.

It is an arithmetic number, because the mean of its divisors is an integer number (11680095).

Almost surely, 2^72305285 is an apocalyptic number.

It is an amenable number.

72305285 is a deficient number, since it is larger than the sum of its proper divisors (21135475).

72305285 is a wasteful number, since it uses less digits than its factorization.

72305285 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1112407.

The product of its (nonzero) digits is 16800, while the sum is 32.

The square root of 72305285 is about 8503.2514369505. The cubic root of 72305285 is about 416.6039155278.

The spelling of 72305285 in words is "seventy-two million, three hundred five thousand, two hundred eighty-five".