78728759587 has 2 divisors, whose sum is σ = 78728759588. Its totient is φ = 78728759586.

The previous prime is 78728759563. The next prime is 78728759633. The reversal of 78728759587 is 78595782787.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78728759587 is a prime.

It is a super-2 number, since 2×78728759587² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78728759387) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39364379793 + 39364379794.

It is an arithmetic number, because the mean of its divisors is an integer number (39364379794).

Almost surely, 2^78728759587 is an apocalyptic number.

78728759587 is a deficient number, since it is larger than the sum of its proper divisors (1).

78728759587 is an equidigital number, since it uses as much as digits as its factorization.

78728759587 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 553190400, while the sum is 73.

The spelling of 78728759587 in words is "seventy-eight billion, seven hundred twenty-eight million, seven hundred fifty-nine thousand, five hundred eighty-seven".