72477217 has 4 divisors (see below), whose sum is σ = 74244996. Its totient is φ = 70709440.

The previous prime is 72477187. The next prime is 72477221. The reversal of 72477217 is 71277427.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5089536 + 67387681 = 2256^2 + 8209^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72477217 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72477017) 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, 883828 + ... + 883909.

It is an arithmetic number, because the mean of its divisors is an integer number (18561249).

Almost surely, 2^72477217 is an apocalyptic number.

It is an amenable number.

72477217 is a deficient number, since it is larger than the sum of its proper divisors (1767779).

72477217 is a wasteful number, since it uses less digits than its factorization.

72477217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767778.

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

The square root of 72477217 is about 8513.3552140152. The cubic root of 72477217 is about 416.9338630358.

The spelling of 72477217 in words is "seventy-two million, four hundred seventy-seven thousand, two hundred seventeen".