72551545 has 32 divisors (see below), whose sum is σ = 100445184. Its totient is φ = 49790400.

The previous prime is 72551543. The next prime is 72551569. The reversal of 72551545 is 54515527.

It is not a de Polignac number, because 72551545 - 2¹ = 72551543 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72551545.

It is not an unprimeable number, because it can be changed into a prime (72551543) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 104650 + ... + 105340.

It is an arithmetic number, because the mean of its divisors is an integer number (3138912).

Almost surely, 2^72551545 is an apocalyptic number.

It is an amenable number.

72551545 is a deficient number, since it is larger than the sum of its proper divisors (27893639).

72551545 is a wasteful number, since it uses less digits than its factorization.

72551545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 813.

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

The square root of 72551545 is about 8517.7194717835. The cubic root of 72551545 is about 417.0763412459.

It can be divided in two parts, 7 and 2551545, that added together give a palindrome (2551552).

The spelling of 72551545 in words is "seventy-two million, five hundred fifty-one thousand, five hundred forty-five".