72721011 has 16 divisors (see below), whose sum is σ = 106248960. Its totient is φ = 43876320.

The previous prime is 72721007. The next prime is 72721013. The reversal of 72721011 is 11012727.

It is a happy number.

It is not a de Polignac number, because 72721011 - 2² = 72721007 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72721013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2746 + ... + 12368.

It is an arithmetic number, because the mean of its divisors is an integer number (6640560).

Almost surely, 2^72721011 is an apocalyptic number.

72721011 is a deficient number, since it is larger than the sum of its proper divisors (33527949).

72721011 is a wasteful number, since it uses less digits than its factorization.

72721011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9866.

The product of its (nonzero) digits is 196, while the sum is 21.

The square root of 72721011 is about 8527.6615200183. The cubic root of 72721011 is about 417.4008245673.

Adding to 72721011 its reverse (11012727), we get a palindrome (83733738).

The spelling of 72721011 in words is "seventy-two million, seven hundred twenty-one thousand, eleven".