72928385 has 8 divisors (see below), whose sum is σ = 92662056. Its totient is φ = 54910720.

The previous prime is 72928379. The next prime is 72928391. The reversal of 72928385 is 58382927.

It is an interprime number because it is at equal distance from previous prime (72928379) and next prime (72928391).

It can be written as a sum of positive squares in 4 ways, for example, as 3055504 + 69872881 = 1748^2 + 8359^2 .

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

It is a de Polignac number, because none of the positive numbers 2^k-72928385 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428906 + ... + 429075.

It is an arithmetic number, because the mean of its divisors is an integer number (11582757).

Almost surely, 2^72928385 is an apocalyptic number.

It is an amenable number.

72928385 is a deficient number, since it is larger than the sum of its proper divisors (19733671).

72928385 is a wasteful number, since it uses less digits than its factorization.

72928385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 858003.

The product of its digits is 241920, while the sum is 44.

The square root of 72928385 is about 8539.8117660754. The cubic root of 72928385 is about 417.7972067135.

The spelling of 72928385 in words is "seventy-two million, nine hundred twenty-eight thousand, three hundred eighty-five".