72109497 has 4 divisors (see below), whose sum is σ = 96146000. Its totient is φ = 48072996.

The previous prime is 72109493. The next prime is 72109507. The reversal of 72109497 is 79490127.

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 an emirpimes, since its reverse is a distinct semiprime: 79490127 = 3 ⋅26496709.

It is not a de Polignac number, because 72109497 - 2² = 72109493 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72109493) 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, 12018247 + ... + 12018252.

It is an arithmetic number, because the mean of its divisors is an integer number (24036500).

Almost surely, 2^72109497 is an apocalyptic number.

It is an amenable number.

72109497 is a deficient number, since it is larger than the sum of its proper divisors (24036503).

72109497 is a wasteful number, since it uses less digits than its factorization.

72109497 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24036502.

The product of its (nonzero) digits is 31752, while the sum is 39.

The square root of 72109497 is about 8491.7310956012. The cubic root of 72109497 is about 416.2275494028.

The spelling of 72109497 in words is "seventy-two million, one hundred nine thousand, four hundred ninety-seven".