72142277 has 4 divisors (see below), whose sum is σ = 72159360. Its totient is φ = 72125196.

The previous prime is 72142249. The next prime is 72142307. The reversal of 72142277 is 77224127.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 77224127 = 53 ⋅1457059.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72142277 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 (72142207) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2924 + ... + 12362.

It is an arithmetic number, because the mean of its divisors is an integer number (18039840).

Almost surely, 2^72142277 is an apocalyptic number.

It is an amenable number.

72142277 is a deficient number, since it is larger than the sum of its proper divisors (17083).

72142277 is an equidigital number, since it uses as much as digits as its factorization.

72142277 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17082.

The product of its digits is 10976, while the sum is 32.

The square root of 72142277 is about 8493.6609892319. The cubic root of 72142277 is about 416.2906103158.

The spelling of 72142277 in words is "seventy-two million, one hundred forty-two thousand, two hundred seventy-seven".