72308101 has 4 divisors (see below), whose sum is σ = 74262412. Its totient is φ = 70353792.

The previous prime is 72308057. The next prime is 72308111. The reversal of 72308101 is 10180327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 27552001 + 44756100 = 5249^2 + 6690^2 .

It is a cyclic number.

It is not a de Polignac number, because 72308101 - 2²¹ = 70210949 is a prime.

It is a super-2 number, since 2×72308101² = 10456922940452402, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72308111) 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 3 ways as a sum of consecutive naturals, for example, 977100 + ... + 977173.

It is an arithmetic number, because the mean of its divisors is an integer number (18565603).

Almost surely, 2^72308101 is an apocalyptic number.

It is an amenable number.

72308101 is a deficient number, since it is larger than the sum of its proper divisors (1954311).

72308101 is a wasteful number, since it uses less digits than its factorization.

72308101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954310.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 72308101 is about 8503.4170190577. The cubic root of 72308101 is about 416.6093238065.

Adding to 72308101 its reverse (10180327), we get a palindrome (82488428).

The spelling of 72308101 in words is "seventy-two million, three hundred eight thousand, one hundred one".