78492281810569 has 27 divisors (see below), whose sum is σ = 89357502481429. Its totient is φ = 68893566045920.

The previous prime is 78492281810477. The next prime is 78492281810573. The reversal of 78492281810569 is 96501818229487.

It is a happy number.

The square root of 78492281810569 is 8859587.

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

It can be written as a sum of positive squares in 4 ways, for example, as 2054191230025 + 76438090580544 = 1433245^2 + 8742888^2 .

It is not a de Polignac number, because 78492281810569 - 2²¹ = 78492279713417 is a prime.

It is a super-2 number, since 2×78492281810569² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78492281810498 and 78492281810507.

It is not an unprimeable number, because it can be changed into a prime (78492281810869) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 2826194367 + ... + 2826222139.

Almost surely, 2^{78492281810569} is an apocalyptic number.

78492281810569 is the 8859587-th square number.

78492281810569 is the 4429794-th centered octagonal number.

It is an amenable number.

78492281810569 is a deficient number, since it is larger than the sum of its proper divisors (10865220670860).

78492281810569 is an frugal number, since it uses more digits than its factorization.

78492281810569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55626 (or 27813 counting only the distinct ones).

The product of its (nonzero) digits is 139345920, while the sum is 70.

The spelling of 78492281810569 in words is "seventy-eight trillion, four hundred ninety-two billion, two hundred eighty-one million, eight hundred ten thousand, five hundred sixty-nine".