72309509387 has 2 divisors, whose sum is σ = 72309509388. Its totient is φ = 72309509386.

The previous prime is 72309509383. The next prime is 72309509423. The reversal of 72309509387 is 78390590327.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72309509387 - 2² = 72309509383 is a prime.

It is a super-2 number, since 2×72309509387² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (72309509383) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36154754693 + 36154754694.

It is an arithmetic number, because the mean of its divisors is an integer number (36154754694).

Almost surely, 2^72309509387 is an apocalyptic number.

72309509387 is a deficient number, since it is larger than the sum of its proper divisors (1).

72309509387 is an equidigital number, since it uses as much as digits as its factorization.

72309509387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The spelling of 72309509387 in words is "seventy-two billion, three hundred nine million, five hundred nine thousand, three hundred eighty-seven".