72537566 has 4 divisors (see below), whose sum is σ = 108806352. Its totient is φ = 36268782.

The previous prime is 72537557. The next prime is 72537583. The reversal of 72537566 is 66573527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66573527 = 127 ⋅524201.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 18134390 + ... + 18134393.

It is an arithmetic number, because the mean of its divisors is an integer number (27201588).

Almost surely, 2^72537566 is an apocalyptic number.

72537566 is a deficient number, since it is larger than the sum of its proper divisors (36268786).

72537566 is a wasteful number, since it uses less digits than its factorization.

72537566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36268785.

The product of its digits is 264600, while the sum is 41.

The square root of 72537566 is about 8516.8988487594. The cubic root of 72537566 is about 417.0495525462.

The spelling of 72537566 in words is "seventy-two million, five hundred thirty-seven thousand, five hundred sixty-six".