72782867089 has 3 divisors (see below), whose sum is σ = 72783136873. Its totient is φ = 72782597306.

The previous prime is 72782867081. The next prime is 72782867099. The reversal of 72782867089 is 98076828727.

It is a happy number.

The square root of 72782867089 is 269783.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is not a de Polignac number, because 72782867089 - 2³ = 72782867081 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72782867089.

It is not an unprimeable number, because it can be changed into a prime (72782867081) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 134892 + ... + 404674.

Almost surely, 2^72782867089 is an apocalyptic number.

72782867089 is the 269783-rd square number.

72782867089 is the 134892-nd centered octagonal number.

It is an amenable number.

72782867089 is a deficient number, since it is larger than the sum of its proper divisors (269784).

72782867089 is an frugal number, since it uses more digits than its factorization.

72782867089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539566 (or 269783 counting only the distinct ones).

The product of its (nonzero) digits is 37933056, while the sum is 64.

Multiplying 72782867089 by its sum of digits (64), we get a square (4658103493696 = 2158264²).

The spelling of 72782867089 in words is "seventy-two billion, seven hundred eighty-two million, eight hundred sixty-seven thousand, eighty-nine".