72661001 has 8 divisors (see below), whose sum is σ = 83095680. Its totient is φ = 62239968.

The previous prime is 72660989. The next prime is 72661003. The reversal of 72661001 is 10016627.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 72661001 - 2⁶ = 72660937 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72661003) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13820 + ... + 18338.

It is an arithmetic number, because the mean of its divisors is an integer number (10386960).

Almost surely, 2^72661001 is an apocalyptic number.

It is an amenable number.

72661001 is a deficient number, since it is larger than the sum of its proper divisors (10434679).

72661001 is a wasteful number, since it uses less digits than its factorization.

72661001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6823.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 72661001 is about 8524.1422442378. The cubic root of 72661001 is about 417.2859787279.

Adding to 72661001 its reverse (10016627), we get a palindrome (82677628).

The spelling of 72661001 in words is "seventy-two million, six hundred sixty-one thousand, one".