72275389 has 4 divisors (see below), whose sum is σ = 73956256. Its totient is φ = 70594524.

The previous prime is 72275363. The next prime is 72275417. The reversal of 72275389 is 98357227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 72275389 - 2⁷ = 72275261 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43), and also a Moran number because the ratio is a prime number: 1680823 = 72275389 / (7 + 2 + 2 + 7 + 5 + 3 + 8 + 9).

It is a Duffinian number.

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, 840369 + ... + 840454.

It is an arithmetic number, because the mean of its divisors is an integer number (18489064).

Almost surely, 2^72275389 is an apocalyptic number.

It is an amenable number.

72275389 is a deficient number, since it is larger than the sum of its proper divisors (1680867).

72275389 is a wasteful number, since it uses less digits than its factorization.

72275389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680866.

The product of its digits is 211680, while the sum is 43.

The square root of 72275389 is about 8501.4933394081. The cubic root of 72275389 is about 416.5464899993.

The spelling of 72275389 in words is "seventy-two million, two hundred seventy-five thousand, three hundred eighty-nine".