72555451 has 4 divisors (see below), whose sum is σ = 74099232. Its totient is φ = 71011672.

The previous prime is 72555449. The next prime is 72555493. The reversal of 72555451 is 15455527.

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

It is a cyclic number.

It is not a de Polignac number, because 72555451 - 2¹ = 72555449 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72555421) 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, 771820 + ... + 771913.

It is an arithmetic number, because the mean of its divisors is an integer number (18524808).

Almost surely, 2^72555451 is an apocalyptic number.

72555451 is a deficient number, since it is larger than the sum of its proper divisors (1543781).

72555451 is a wasteful number, since it uses less digits than its factorization.

72555451 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1543780.

The product of its digits is 35000, while the sum is 34.

The square root of 72555451 is about 8517.9487554223. The cubic root of 72555451 is about 417.0838259060.

The spelling of 72555451 in words is "seventy-two million, five hundred fifty-five thousand, four hundred fifty-one".