72706577 has 4 divisors (see below), whose sum is σ = 72733680. Its totient is φ = 72679476.

The previous prime is 72706561. The next prime is 72706583. The reversal of 72706577 is 77560727.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72706577 - 2⁴ = 72706561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72706547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9023 + ... + 15060.

It is an arithmetic number, because the mean of its divisors is an integer number (18183420).

Almost surely, 2^72706577 is an apocalyptic number.

It is an amenable number.

72706577 is a deficient number, since it is larger than the sum of its proper divisors (27103).

72706577 is a wasteful number, since it uses less digits than its factorization.

72706577 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27102.

The product of its (nonzero) digits is 144060, while the sum is 41.

The square root of 72706577 is about 8526.8151733223. The cubic root of 72706577 is about 417.3732068629.

The spelling of 72706577 in words is "seventy-two million, seven hundred six thousand, five hundred seventy-seven".