72087329 has 4 divisors (see below), whose sum is σ = 72131220. Its totient is φ = 72043440.

The previous prime is 72087319. The next prime is 72087341. The reversal of 72087329 is 92378027.

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 7317025 + 64770304 = 2705^2 + 8048^2 .

It is a cyclic number.

It is not a de Polignac number, because 72087329 - 2²⁴ = 55310113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 72087292 and 72087301.

It is not an unprimeable number, because it can be changed into a prime (72087319) 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, 19382 + ... + 22799.

It is an arithmetic number, because the mean of its divisors is an integer number (18032805).

Almost surely, 2^72087329 is an apocalyptic number.

It is an amenable number.

72087329 is a deficient number, since it is larger than the sum of its proper divisors (43891).

72087329 is a wasteful number, since it uses less digits than its factorization.

72087329 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43890.

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

The square root of 72087329 is about 8490.4257254863. The cubic root of 72087329 is about 416.1848926175.

The spelling of 72087329 in words is "seventy-two million, eighty-seven thousand, three hundred twenty-nine".