72947573 has 4 divisors (see below), whose sum is σ = 73871040. Its totient is φ = 72024108.

The previous prime is 72947551. The next prime is 72947639. The reversal of 72947573 is 37574927.

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: 37574927 = 13 ⋅2890379.

It is a cyclic number.

It is not a de Polignac number, because 72947573 - 2¹⁶ = 72882037 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72947503) 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, 461615 + ... + 461772.

It is an arithmetic number, because the mean of its divisors is an integer number (18467760).

Almost surely, 2^72947573 is an apocalyptic number.

It is an amenable number.

72947573 is a deficient number, since it is larger than the sum of its proper divisors (923467).

72947573 is an equidigital number, since it uses as much as digits as its factorization.

72947573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 923466.

The product of its digits is 370440, while the sum is 44.

The square root of 72947573 is about 8540.9351361546. The cubic root of 72947573 is about 417.8338453503.

The spelling of 72947573 in words is "seventy-two million, nine hundred forty-seven thousand, five hundred seventy-three".