72806390 has 8 divisors (see below), whose sum is σ = 131051520. Its totient is φ = 29122552.

The previous prime is 72806389. The next prime is 72806411. The reversal of 72806390 is 9360827.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 72806390.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3640310 + ... + 3640329.

It is an arithmetic number, because the mean of its divisors is an integer number (16381440).

Almost surely, 2^72806390 is an apocalyptic number.

72806390 is a deficient number, since it is larger than the sum of its proper divisors (58245130).

72806390 is a wasteful number, since it uses less digits than its factorization.

72806390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280646.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 72806390 is about 8532.6660546397. Note that the first 3 decimals coincide. The cubic root of 72806390 is about 417.5641122096.

The spelling of 72806390 in words is "seventy-two million, eight hundred six thousand, three hundred ninety".