72013537 has 4 divisors (see below), whose sum is σ = 72531760. Its totient is φ = 71495316.

The previous prime is 72013531. The next prime is 72013559. The reversal of 72013537 is 73531027.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72013537 is a prime.

It is a super-2 number, since 2×72013537² = 10371899022500738, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72013531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 258903 + ... + 259180.

It is an arithmetic number, because the mean of its divisors is an integer number (18132940).

Almost surely, 2^72013537 is an apocalyptic number.

It is an amenable number.

72013537 is a deficient number, since it is larger than the sum of its proper divisors (518223).

72013537 is a wasteful number, since it uses less digits than its factorization.

72013537 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 518222.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 72013537 is about 8486.0790121233. The cubic root of 72013537 is about 416.0428352865.

The spelling of 72013537 in words is "seventy-two million, thirteen thousand, five hundred thirty-seven".