72355565 has 4 divisors (see below), whose sum is σ = 86826684. Its totient is φ = 57884448.

The previous prime is 72355561. The next prime is 72355573. The reversal of 72355565 is 56555327.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56555327 = 2027 ⋅27901.

It can be written as a sum of positive squares in 2 ways, for example, as 45346756 + 27008809 = 6734^2 + 5197^2 .

It is a cyclic number.

It is not a de Polignac number, because 72355565 - 2² = 72355561 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 (72355561) 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, 7235552 + ... + 7235561.

It is an arithmetic number, because the mean of its divisors is an integer number (21706671).

Almost surely, 2^72355565 is an apocalyptic number.

It is an amenable number.

72355565 is a deficient number, since it is larger than the sum of its proper divisors (14471119).

72355565 is a wasteful number, since it uses less digits than its factorization.

72355565 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14471118.

The product of its digits is 157500, while the sum is 38.

The square root of 72355565 is about 8506.2074392763. The cubic root of 72355565 is about 416.7004598370.

The spelling of 72355565 in words is "seventy-two million, three hundred fifty-five thousand, five hundred sixty-five".