72471345 has 16 divisors (see below), whose sum is σ = 119088960. Its totient is φ = 37606464.

The previous prime is 72471337. The next prime is 72471349. The reversal of 72471345 is 54317427.

It is not a de Polignac number, because 72471345 - 2³ = 72471337 is a prime.

It is a super-2 number, since 2×72471345² = 10504191692218050, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (72471349) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64735 + ... + 65844.

It is an arithmetic number, because the mean of its divisors is an integer number (7443060).

Almost surely, 2^72471345 is an apocalyptic number.

It is an amenable number.

72471345 is a deficient number, since it is larger than the sum of its proper divisors (46617615).

72471345 is a wasteful number, since it uses less digits than its factorization.

72471345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130624.

The product of its digits is 23520, while the sum is 33.

The square root of 72471345 is about 8513.0103371252. The cubic root of 72471345 is about 416.9226029375.

The spelling of 72471345 in words is "seventy-two million, four hundred seventy-one thousand, three hundred forty-five".