72120553 has 4 divisors (see below), whose sum is σ = 72167040. Its totient is φ = 72074068.

The previous prime is 72120547. The next prime is 72120563. The reversal of 72120553 is 35502127.

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: 35502127 = 19 ⋅1868533.

It is a cyclic number.

It is not a de Polignac number, because 72120553 - 2¹³ = 72112361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72120533) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20833 + ... + 24046.

It is an arithmetic number, because the mean of its divisors is an integer number (18041760).

Almost surely, 2^72120553 is an apocalyptic number.

It is an amenable number.

72120553 is a deficient number, since it is larger than the sum of its proper divisors (46487).

72120553 is a wasteful number, since it uses less digits than its factorization.

72120553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46486.

The product of its (nonzero) digits is 2100, while the sum is 25.

The square root of 72120553 is about 8492.3820568790. The cubic root of 72120553 is about 416.2488206491.

The spelling of 72120553 in words is "seventy-two million, one hundred twenty thousand, five hundred fifty-three".