72055553 has 4 divisors (see below), whose sum is σ = 72097620. Its totient is φ = 72013488.

The previous prime is 72055549. The next prime is 72055583. The reversal of 72055553 is 35555027.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 67699984 + 4355569 = 8228^2 + 2087^2 .

It is a cyclic number.

It is not a de Polignac number, because 72055553 - 2² = 72055549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72055513) 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, 18350 + ... + 21927.

It is an arithmetic number, because the mean of its divisors is an integer number (18024405).

Almost surely, 2^72055553 is an apocalyptic number.

It is an amenable number.

72055553 is a deficient number, since it is larger than the sum of its proper divisors (42067).

72055553 is a wasteful number, since it uses less digits than its factorization.

72055553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42066.

The product of its (nonzero) digits is 26250, while the sum is 32.

The square root of 72055553 is about 8488.5542349684. The cubic root of 72055553 is about 416.1237323787.

The spelling of 72055553 in words is "seventy-two million, fifty-five thousand, five hundred fifty-three".