72757943 has 4 divisors (see below), whose sum is σ = 77037840. Its totient is φ = 68478048.

The previous prime is 72757939. The next prime is 72757957. The reversal of 72757943 is 34975727.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72757943 - 2² = 72757939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72757894 and 72757903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72757343) 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, 2139923 + ... + 2139956.

It is an arithmetic number, because the mean of its divisors is an integer number (19259460).

Almost surely, 2^72757943 is an apocalyptic number.

72757943 is a deficient number, since it is larger than the sum of its proper divisors (4279897).

72757943 is a wasteful number, since it uses less digits than its factorization.

72757943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279896.

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

The square root of 72757943 is about 8529.8266688134. The cubic root of 72757943 is about 417.4714728258.

The spelling of 72757943 in words is "seventy-two million, seven hundred fifty-seven thousand, nine hundred forty-three".