72501647 has 4 divisors (see below), whose sum is σ = 72529080. Its totient is φ = 72474216.

The previous prime is 72501643. The next prime is 72501661. The reversal of 72501647 is 74610527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72501647 - 2² = 72501643 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72501643) 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, 9272 + ... + 15197.

It is an arithmetic number, because the mean of its divisors is an integer number (18132270).

Almost surely, 2^72501647 is an apocalyptic number.

72501647 is a deficient number, since it is larger than the sum of its proper divisors (27433).

72501647 is a wasteful number, since it uses less digits than its factorization.

72501647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27432.

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 72501647 is about 8514.7898975841. The cubic root of 72501647 is about 416.9807032727.

The spelling of 72501647 in words is "seventy-two million, five hundred one thousand, six hundred forty-seven".