72642943 has 4 divisors (see below), whose sum is σ = 72944608. Its totient is φ = 72341280.

The previous prime is 72642917. The next prime is 72642971. The reversal of 72642943 is 34924627.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 34924627 = 307 ⋅113761.

It is a cyclic number.

It is not a de Polignac number, because 72642943 - 2⁹ = 72642431 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 (72645943) 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, 150471 + ... + 150952.

It is an arithmetic number, because the mean of its divisors is an integer number (18236152).

Almost surely, 2^72642943 is an apocalyptic number.

72642943 is a deficient number, since it is larger than the sum of its proper divisors (301665).

72642943 is a wasteful number, since it uses less digits than its factorization.

72642943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 301664.

The product of its digits is 72576, while the sum is 37.

The square root of 72642943 is about 8523.0829516085. The cubic root of 72642943 is about 417.2514073419.

The spelling of 72642943 in words is "seventy-two million, six hundred forty-two thousand, nine hundred forty-three".