72706586 has 8 divisors (see below), whose sum is σ = 115475220. Its totient is φ = 34214848.

The previous prime is 72706583. The next prime is 72706609. The reversal of 72706586 is 68560727.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 72573361 + 133225 = 8519^2 + 365^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72706583) 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, 1069181 + ... + 1069248.

Almost surely, 2^72706586 is an apocalyptic number.

72706586 is a deficient number, since it is larger than the sum of its proper divisors (42768634).

72706586 is a wasteful number, since it uses less digits than its factorization.

72706586 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2138448.

The product of its (nonzero) digits is 141120, while the sum is 41.

The square root of 72706586 is about 8526.8157010692. The cubic root of 72706586 is about 417.3732240844.

The spelling of 72706586 in words is "seventy-two million, seven hundred six thousand, five hundred eighty-six".