72440187 has 4 divisors (see below), whose sum is σ = 96586920. Its totient is φ = 48293456.

The previous prime is 72440167. The next prime is 72440227. The reversal of 72440187 is 78104427.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72440187 - 2²² = 68245883 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72440167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12073362 + ... + 12073367.

It is an arithmetic number, because the mean of its divisors is an integer number (24146730).

Almost surely, 2^72440187 is an apocalyptic number.

72440187 is a deficient number, since it is larger than the sum of its proper divisors (24146733).

72440187 is a wasteful number, since it uses less digits than its factorization.

72440187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24146732.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 72440187 is about 8511.1801179390. The cubic root of 72440187 is about 416.8628444376.

It can be divided in two parts, 72440 and 187, that added together give a palindrome (72627).

The spelling of 72440187 in words is "seventy-two million, four hundred forty thousand, one hundred eighty-seven".