72087293 has 6 divisors (see below), whose sum is σ = 76577466. Its totient is φ = 67846592.

The previous prime is 72087287. The next prime is 72087317. The reversal of 72087293 is 39278027.

It can be written as a sum of positive squares in 3 ways, for example, as 8773444 + 63313849 = 2962^2 + 7957^2 .

It is not a de Polignac number, because 72087293 - 2⁴ = 72087277 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72087593) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 124430 + ... + 125007.

It is an arithmetic number, because the mean of its divisors is an integer number (12762911).

Almost surely, 2^72087293 is an apocalyptic number.

It is an amenable number.

72087293 is a deficient number, since it is larger than the sum of its proper divisors (4490173).

72087293 is a wasteful number, since it uses less digits than its factorization.

72087293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 249471 (or 249454 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 72087293 is about 8490.4236054510. The cubic root of 72087293 is about 416.1848233374.

The spelling of 72087293 in words is "seventy-two million, eighty-seven thousand, two hundred ninety-three".