72188087 has 6 divisors (see below), whose sum is σ = 76187808. Its totient is φ = 68388372.

The previous prime is 72188063. The next prime is 72188101. The reversal of 72188087 is 78088127.

It is not a de Polignac number, because 72188087 - 2⁶ = 72188023 is a prime.

It is a super-2 number, since 2×72188087² = 10422239809439138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72188027) 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, 99623 + ... + 100344.

It is an arithmetic number, because the mean of its divisors is an integer number (12697968).

Almost surely, 2^72188087 is an apocalyptic number.

72188087 is a deficient number, since it is larger than the sum of its proper divisors (3999721).

72188087 is a wasteful number, since it uses less digits than its factorization.

72188087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 200005 (or 199986 counting only the distinct ones).

The product of its (nonzero) digits is 50176, while the sum is 41.

The square root of 72188087 is about 8496.3572782693. The cubic root of 72188087 is about 416.3787058522.

The spelling of 72188087 in words is "seventy-two million, one hundred eighty-eight thousand, eighty-seven".