72758611985 has 4 divisors (see below), whose sum is σ = 87310334388. Its totient is φ = 58206889584.

The previous prime is 72758611979. The next prime is 72758612023. The reversal of 72758611985 is 58911685727.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58911685727 = 29567 ⋅1992481.

It can be written as a sum of positive squares in 2 ways, for example, as 10230108736 + 62528503249 = 101144^2 + 250057^2 .

It is a cyclic number.

It is not a de Polignac number, because 72758611985 - 2¹⁸ = 72758349841 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7275861194 + ... + 7275861203.

It is an arithmetic number, because the mean of its divisors is an integer number (21827583597).

Almost surely, 2^72758611985 is an apocalyptic number.

It is an amenable number.

72758611985 is a deficient number, since it is larger than the sum of its proper divisors (14551722403).

72758611985 is a wasteful number, since it uses less digits than its factorization.

72758611985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14551722402.

The product of its digits is 8467200, while the sum is 59.

The spelling of 72758611985 in words is "seventy-two billion, seven hundred fifty-eight million, six hundred eleven thousand, nine hundred eighty-five".