72155413 has 4 divisors (see below), whose sum is σ = 78715008. Its totient is φ = 65595820.

The previous prime is 72155399. The next prime is 72155417. The reversal of 72155413 is 31455127.

It is a happy number.

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 72155413 - 2¹³ = 72147221 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 (72155417) 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, 3279781 + ... + 3279802.

It is an arithmetic number, because the mean of its divisors is an integer number (19678752).

Almost surely, 2^72155413 is an apocalyptic number.

It is an amenable number.

72155413 is a deficient number, since it is larger than the sum of its proper divisors (6559595).

72155413 is a wasteful number, since it uses less digits than its factorization.

72155413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6559594.

The product of its digits is 4200, while the sum is 28.

The square root of 72155413 is about 8494.4342366046. The cubic root of 72155413 is about 416.3158754900.

The spelling of 72155413 in words is "seventy-two million, one hundred fifty-five thousand, four hundred thirteen".