72011671 has 4 divisors (see below), whose sum is σ = 72036000. Its totient is φ = 71987344.

The previous prime is 72011633. The next prime is 72011699. The reversal of 72011671 is 17611027.

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 72011671 - 2¹³ = 72003479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72014671) 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, 6991 + ... + 13888.

It is an arithmetic number, because the mean of its divisors is an integer number (18009000).

Almost surely, 2^72011671 is an apocalyptic number.

72011671 is a deficient number, since it is larger than the sum of its proper divisors (24329).

72011671 is a wasteful number, since it uses less digits than its factorization.

72011671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24328.

The product of its (nonzero) digits is 588, while the sum is 25.

The square root of 72011671 is about 8485.9690666417. The cubic root of 72011671 is about 416.0392417832.

Adding to 72011671 its reverse (17611027), we get a palindrome (89622698).

The spelling of 72011671 in words is "seventy-two million, eleven thousand, six hundred seventy-one".