72355109 has 4 divisors (see below), whose sum is σ = 73435104. Its totient is φ = 71275116.

The previous prime is 72355093. The next prime is 72355139. The reversal of 72355109 is 90155327.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90155327 = 101 ⋅892627.

It is a cyclic number.

It is not a de Polignac number, because 72355109 - 2⁴ = 72355093 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 (72355139) 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, 539897 + ... + 540030.

It is an arithmetic number, because the mean of its divisors is an integer number (18358776).

Almost surely, 2^72355109 is an apocalyptic number.

It is an amenable number.

72355109 is a deficient number, since it is larger than the sum of its proper divisors (1079995).

72355109 is a wasteful number, since it uses less digits than its factorization.

72355109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079994.

The product of its (nonzero) digits is 9450, while the sum is 32.

The square root of 72355109 is about 8506.1806352793. The cubic root of 72355109 is about 416.6995844571.

The spelling of 72355109 in words is "seventy-two million, three hundred fifty-five thousand, one hundred nine".