72187287 has 24 divisors (see below), whose sum is σ = 103152000. Its totient is φ = 44893056.

The previous prime is 72187279. The next prime is 72187331. The reversal of 72187287 is 78278127.

It is not a de Polignac number, because 72187287 - 2³ = 72187279 is a prime.

It is a super-2 number, since 2×72187287² = 10422008808840738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72187387) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 120214 + ... + 120812.

It is an arithmetic number, because the mean of its divisors is an integer number (4298000).

Almost surely, 2^72187287 is an apocalyptic number.

72187287 is a deficient number, since it is larger than the sum of its proper divisors (30964713).

72187287 is a wasteful number, since it uses less digits than its factorization.

72187287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 775 (or 758 counting only the distinct ones).

The product of its digits is 87808, while the sum is 42.

The square root of 72187287 is about 8496.3101991394. The cubic root of 72187287 is about 416.3771677212.

The spelling of 72187287 in words is "seventy-two million, one hundred eighty-seven thousand, two hundred eighty-seven".