72941989 has 4 divisors (see below), whose sum is σ = 75457260. Its totient is φ = 70426720.

The previous prime is 72941987. The next prime is 72942013. The reversal of 72941989 is 98914927.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 48191364 + 24750625 = 6942^2 + 4975^2 .

It is a cyclic number.

It is not a de Polignac number, because 72941989 - 2¹ = 72941987 is a prime.

It is a super-2 number, since 2×72941989² = 10641067518552242, 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 (72941987) 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, 1257592 + ... + 1257649.

It is an arithmetic number, because the mean of its divisors is an integer number (18864315).

Almost surely, 2^72941989 is an apocalyptic number.

It is an amenable number.

72941989 is a deficient number, since it is larger than the sum of its proper divisors (2515271).

72941989 is a wasteful number, since it uses less digits than its factorization.

72941989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2515270.

The product of its digits is 326592, while the sum is 49.

The square root of 72941989 is about 8540.6082336096. The cubic root of 72941989 is about 417.8231836123.

The spelling of 72941989 in words is "seventy-two million, nine hundred forty-one thousand, nine hundred eighty-nine".