72187001 has 4 divisors (see below), whose sum is σ = 72240000. Its totient is φ = 72134004.

The previous prime is 72186997. The next prime is 72187013. The reversal of 72187001 is 10078127.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72187001 - 2² = 72186997 is a prime.

It is a super-2 number, since 2×72187001² = 10421926226748002, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72187091) 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, 24401 + ... + 27198.

It is an arithmetic number, because the mean of its divisors is an integer number (18060000).

Almost surely, 2^72187001 is an apocalyptic number.

It is an amenable number.

72187001 is a deficient number, since it is larger than the sum of its proper divisors (52999).

72187001 is a wasteful number, since it uses less digits than its factorization.

72187001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52998.

The product of its (nonzero) digits is 784, while the sum is 26.

The square root of 72187001 is about 8496.2933682871. The cubic root of 72187001 is about 416.3766178367.

The spelling of 72187001 in words is "seventy-two million, one hundred eighty-seven thousand, one".