72240051 has 16 divisors (see below), whose sum is σ = 104138496. Its totient is φ = 44280096.

The previous prime is 72240037. The next prime is 72240101. The reversal of 72240051 is 15004227.

It is not a de Polignac number, because 72240051 - 2²¹ = 70142899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72240031) 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, 6736 + ... + 13778.

It is an arithmetic number, because the mean of its divisors is an integer number (6508656).

Almost surely, 2^72240051 is an apocalyptic number.

72240051 is a deficient number, since it is larger than the sum of its proper divisors (31898445).

72240051 is a wasteful number, since it uses less digits than its factorization.

72240051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7322.

The product of its (nonzero) digits is 560, while the sum is 21.

The square root of 72240051 is about 8499.4147445574. The cubic root of 72240051 is about 416.4785908165.

Adding to 72240051 its reverse (15004227), we get a palindrome (87244278).

The spelling of 72240051 in words is "seventy-two million, two hundred forty thousand, fifty-one".