72717247 has 8 divisors (see below), whose sum is σ = 74818656. Its totient is φ = 70623072.

The previous prime is 72717217. The next prime is 72717251. The reversal of 72717247 is 74271727.

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 72717247 - 2⁷ = 72717119 is a prime.

It is a super-2 number, since 2×72717247² = 10575596022518018, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72717217) 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, 23598 + ... + 26500.

It is an arithmetic number, because the mean of its divisors is an integer number (9352332).

Almost surely, 2^72717247 is an apocalyptic number.

72717247 is a deficient number, since it is larger than the sum of its proper divisors (2101409).

72717247 is a wasteful number, since it uses less digits than its factorization.

72717247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3617.

The product of its digits is 38416, while the sum is 37.

The square root of 72717247 is about 8527.4408236000. The cubic root of 72717247 is about 417.3936229631.

The spelling of 72717247 in words is "seventy-two million, seven hundred seventeen thousand, two hundred forty-seven".