72513643 has 2 divisors, whose sum is σ = 72513644. Its totient is φ = 72513642.

The previous prime is 72513629. The next prime is 72513677. The reversal of 72513643 is 34631527.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72513643 - 2⁹ = 72513131 is a prime.

It is a super-2 number, since 2×72513643² = 10516456842262898, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72553643) 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 as a sum of consecutive naturals, namely, 36256821 + 36256822.

It is an arithmetic number, because the mean of its divisors is an integer number (36256822).

Almost surely, 2^72513643 is an apocalyptic number.

72513643 is a deficient number, since it is larger than the sum of its proper divisors (1).

72513643 is an equidigital number, since it uses as much as digits as its factorization.

72513643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 15120, while the sum is 31.

The square root of 72513643 is about 8515.4942898225. The cubic root of 72513643 is about 417.0036996453.

The spelling of 72513643 in words is "seventy-two million, five hundred thirteen thousand, six hundred forty-three".