72126277 has 4 divisors (see below), whose sum is σ = 74613420. Its totient is φ = 69639136.

The previous prime is 72126259. The next prime is 72126287. The reversal of 72126277 is 77262127.

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 41589601 + 30536676 = 6449^2 + 5526^2 .

It is a cyclic number.

It is not a de Polignac number, because 72126277 - 2¹¹ = 72124229 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 (72126227) 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, 1243528 + ... + 1243585.

It is an arithmetic number, because the mean of its divisors is an integer number (18653355).

Almost surely, 2^72126277 is an apocalyptic number.

It is an amenable number.

72126277 is a deficient number, since it is larger than the sum of its proper divisors (2487143).

72126277 is a wasteful number, since it uses less digits than its factorization.

72126277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2487142.

The product of its digits is 16464, while the sum is 34.

The square root of 72126277 is about 8492.7190581109. The cubic root of 72126277 is about 416.2598325134.

The spelling of 72126277 in words is "seventy-two million, one hundred twenty-six thousand, two hundred seventy-seven".