72205587 has 10 divisors (see below), whose sum is σ = 107862788. Its totient is φ = 48137004.

The previous prime is 72205571. The next prime is 72205589. The reversal of 72205587 is 78550227.

72205587 is a `hidden beast` number, since 72 + 2 + 0 + 5 + 587 = 666.

It is not a de Polignac number, because 72205587 - 2⁴ = 72205571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72205589) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 445633 + ... + 445794.

Almost surely, 2^72205587 is an apocalyptic number.

72205587 is a deficient number, since it is larger than the sum of its proper divisors (35657201).

72205587 is an equidigital number, since it uses as much as digits as its factorization.

72205587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 891439 (or 891430 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 36.

The square root of 72205587 is about 8497.3870689760. The cubic root of 72205587 is about 416.4123496242.

The spelling of 72205587 in words is "seventy-two million, two hundred five thousand, five hundred eighty-seven".