72757523 has 4 divisors (see below), whose sum is σ = 72987360. Its totient is φ = 72527688.

The previous prime is 72757519. The next prime is 72757537. The reversal of 72757523 is 32575727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 32575727 = 173 ⋅188299.

It is a cyclic number.

It is not a de Polignac number, because 72757523 - 2² = 72757519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72757513) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114443 + ... + 115076.

It is an arithmetic number, because the mean of its divisors is an integer number (18246840).

Almost surely, 2^72757523 is an apocalyptic number.

72757523 is a deficient number, since it is larger than the sum of its proper divisors (229837).

72757523 is a wasteful number, since it uses less digits than its factorization.

72757523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229836.

The product of its digits is 102900, while the sum is 38.

The square root of 72757523 is about 8529.8020492858. The cubic root of 72757523 is about 417.4706695305.

The spelling of 72757523 in words is "seventy-two million, seven hundred fifty-seven thousand, five hundred twenty-three".