78822247009 has 9 divisors (see below), whose sum is σ = 86642724049. Its totient is φ = 71653780660.

The previous prime is 78822246967. The next prime is 78822247043. The reversal of 78822247009 is 90074222887.

The square root of 78822247009 is 280753.

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

It is not a de Polignac number, because 78822247009 - 2¹¹ = 78822244961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78822247069) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 3075522 + ... + 3101044.

Almost surely, 2^78822247009 is an apocalyptic number.

78822247009 is the 280753-rd square number.

78822247009 is the 140377-th centered octagonal number.

It is an amenable number.

78822247009 is a deficient number, since it is larger than the sum of its proper divisors (7820477040).

78822247009 is an frugal number, since it uses more digits than its factorization.

78822247009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51068 (or 25534 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 49.

Multiplying 78822247009 by its sum of digits (49), we get a square (3862290103441 = 1965271²).

The spelling of 78822247009 in words is "seventy-eight billion, eight hundred twenty-two million, two hundred forty-seven thousand, nine".