72245513 has 4 divisors (see below), whose sum is σ = 72413568. Its totient is φ = 72077460.

The previous prime is 72245501. The next prime is 72245521. The reversal of 72245513 is 31554227.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 72245513 - 2¹⁰ = 72244489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72245713) 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, 83381 + ... + 84242.

It is an arithmetic number, because the mean of its divisors is an integer number (18103392).

Almost surely, 2^72245513 is an apocalyptic number.

It is an amenable number.

72245513 is a deficient number, since it is larger than the sum of its proper divisors (168055).

72245513 is a wasteful number, since it uses less digits than its factorization.

72245513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168054.

The product of its digits is 8400, while the sum is 29.

The square root of 72245513 is about 8499.7360547255. The cubic root of 72245513 is about 416.4890870657.

The spelling of 72245513 in words is "seventy-two million, two hundred forty-five thousand, five hundred thirteen".