72823786537 has 4 divisors (see below), whose sum is σ = 75334951620. Its totient is φ = 70312621456.

The previous prime is 72823786513. The next prime is 72823786559. The reversal of 72823786537 is 73568732827.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 73568732827 = 109 ⋅674942503.

It can be written as a sum of positive squares in 2 ways, for example, as 45275753961 + 27548032576 = 212781^2 + 165976^2 .

It is a cyclic number.

It is not a de Polignac number, because 72823786537 - 2²³ = 72815397929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72823786337) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255582498 + ... + 1255582555.

It is an arithmetic number, because the mean of its divisors is an integer number (18833737905).

Almost surely, 2^72823786537 is an apocalyptic number.

It is an amenable number.

72823786537 is a deficient number, since it is larger than the sum of its proper divisors (2511165083).

72823786537 is a wasteful number, since it uses less digits than its factorization.

72823786537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511165082.

The product of its digits is 23708160, while the sum is 58.

The spelling of 72823786537 in words is "seventy-two billion, eight hundred twenty-three million, seven hundred eighty-six thousand, five hundred thirty-seven".