72775247 has 4 divisors (see below), whose sum is σ = 73495896. Its totient is φ = 72054600.

The previous prime is 72775237. The next prime is 72775253. The reversal of 72775247 is 74257727.

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 72775247 - 2⁴ = 72775231 is a prime.

It is a super-2 number, since 2×72775247² = 10592473151822018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72775217) 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, 360173 + ... + 360374.

It is an arithmetic number, because the mean of its divisors is an integer number (18373974).

Almost surely, 2^72775247 is an apocalyptic number.

72775247 is a deficient number, since it is larger than the sum of its proper divisors (720649).

72775247 is a wasteful number, since it uses less digits than its factorization.

72775247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 720648.

The product of its digits is 192080, while the sum is 41.

The square root of 72775247 is about 8530.8409315846. The cubic root of 72775247 is about 417.5045659080.

The spelling of 72775247 in words is "seventy-two million, seven hundred seventy-five thousand, two hundred forty-seven".