72540187 has 2 divisors, whose sum is σ = 72540188. Its totient is φ = 72540186.

The previous prime is 72540161. The next prime is 72540191. The reversal of 72540187 is 78104527.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 72540187 - 2⁷ = 72540059 is a prime.

It is not a weakly prime, because it can be changed into another prime (72541187) 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 as a sum of consecutive naturals, namely, 36270093 + 36270094.

It is an arithmetic number, because the mean of its divisors is an integer number (36270094).

Almost surely, 2^72540187 is an apocalyptic number.

72540187 is a deficient number, since it is larger than the sum of its proper divisors (1).

72540187 is an equidigital number, since it uses as much as digits as its factorization.

72540187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 15680, while the sum is 34.

The square root of 72540187 is about 8517.0527179301. The cubic root of 72540187 is about 417.0545755697.

It can be divided in two parts, 72540 and 187, that added together give a palindrome (72727).

The spelling of 72540187 in words is "seventy-two million, five hundred forty thousand, one hundred eighty-seven".