72537156 has 18 divisors (see below), whose sum is σ = 183357902. Its totient is φ = 24179040.

The previous prime is 72537151. The next prime is 72537161. The reversal of 72537156 is 65173527.

72537156 is a `hidden beast` number, since 72 + 537 + 1 + 56 = 666.

72537156 is nontrivially palindromic in base 15.

It is an interprime number because it is at equal distance from previous prime (72537151) and next prime (72537161).

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 22410756 = 7080^2 + 4734^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2014921 = 72537156 / (7 + 2 + 5 + 3 + 7 + 1 + 5 + 6).

It is a self number, because there is not a number n which added to its sum of digits gives 72537156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72537151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1007425 + ... + 1007496.

Almost surely, 2^72537156 is an apocalyptic number.

It is an amenable number.

72537156 is an abundant number, since it is smaller than the sum of its proper divisors (110820746).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

72537156 is a wasteful number, since it uses less digits than its factorization.

72537156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2014931 (or 2014926 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 72537156 is about 8516.8747789315. The cubic root of 72537156 is about 417.0487667895.

The spelling of 72537156 in words is "seventy-two million, five hundred thirty-seven thousand, one hundred fifty-six".