72071621 has 8 divisors (see below), whose sum is σ = 75340800. Its totient is φ = 68861520.

The previous prime is 72071599. The next prime is 72071647. The reversal of 72071621 is 12617027.

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

It is a cyclic number.

It is not a de Polignac number, because 72071621 - 2⁶ = 72071557 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 (72074621) 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, 12266 + ... + 17163.

It is an arithmetic number, because the mean of its divisors is an integer number (9417600).

Almost surely, 2^72071621 is an apocalyptic number.

It is an amenable number.

72071621 is a deficient number, since it is larger than the sum of its proper divisors (3269179).

72071621 is a wasteful number, since it uses less digits than its factorization.

72071621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29539.

The product of its (nonzero) digits is 1176, while the sum is 26.

The square root of 72071621 is about 8489.5006331350. The cubic root of 72071621 is about 416.1546611964.

Adding to 72071621 its reverse (12617027), we get a palindrome (84688648).

The spelling of 72071621 in words is "seventy-two million, seventy-one thousand, six hundred twenty-one".