72103771 has 4 divisors (see below), whose sum is σ = 72124344. Its totient is φ = 72083200.

The previous prime is 72103751. The next prime is 72103807. The reversal of 72103771 is 17730127.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17730127 = 317 ⋅55931.

It is a cyclic number.

It is not a de Polignac number, because 72103771 - 2¹³ = 72095579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72103711) 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, 3565 + ... + 12526.

It is an arithmetic number, because the mean of its divisors is an integer number (18031086).

Almost surely, 2^72103771 is an apocalyptic number.

72103771 is a deficient number, since it is larger than the sum of its proper divisors (20573).

72103771 is a wasteful number, since it uses less digits than its factorization.

72103771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20572.

The product of its (nonzero) digits is 2058, while the sum is 28.

The square root of 72103771 is about 8491.3939373933. The cubic root of 72103771 is about 416.2165319819.

Adding to 72103771 its reverse (17730127), we get a palindrome (89833898).

The spelling of 72103771 in words is "seventy-two million, one hundred three thousand, seven hundred seventy-one".