72288109 has 4 divisors (see below), whose sum is σ = 73367104. Its totient is φ = 71209116.

The previous prime is 72288107. The next prime is 72288113. The reversal of 72288109 is 90188227.

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 72288109 - 2¹ = 72288107 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72288107) 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, 539397 + ... + 539530.

It is an arithmetic number, because the mean of its divisors is an integer number (18341776).

Almost surely, 2^72288109 is an apocalyptic number.

It is an amenable number.

72288109 is a deficient number, since it is larger than the sum of its proper divisors (1078995).

72288109 is a wasteful number, since it uses less digits than its factorization.

72288109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078994.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 72288109 is about 8502.2414103576. The cubic root of 72288109 is about 416.5709250600.

It can be divided in two parts, 722 and 88109, that added together give a triangular number (88831 = T₄₂₁).

The spelling of 72288109 in words is "seventy-two million, two hundred eighty-eight thousand, one hundred nine".