72399641 has 2 divisors, whose sum is σ = 72399642. Its totient is φ = 72399640.

The previous prime is 72399637. The next prime is 72399697. The reversal of 72399641 is 14699327.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 51423241 + 20976400 = 7171^2 + 4580^2 .

It is a cyclic number.

It is not a de Polignac number, because 72399641 - 2² = 72399637 is a prime.

It is a super-3 number, since 3×72399641³ (a number of 25 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (72399611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36199820 + 36199821.

It is an arithmetic number, because the mean of its divisors is an integer number (36199821).

Almost surely, 2^72399641 is an apocalyptic number.

It is an amenable number.

72399641 is a deficient number, since it is larger than the sum of its proper divisors (1).

72399641 is an equidigital number, since it uses as much as digits as its factorization.

72399641 is an evil number, because the sum of its binary digits is even.

The product of its digits is 81648, while the sum is 41.

The square root of 72399641 is about 8508.7978586872. The cubic root of 72399641 is about 416.7850548568.

The spelling of 72399641 in words is "seventy-two million, three hundred ninety-nine thousand, six hundred forty-one".