78215020273 has 16 divisors (see below), whose sum is σ = 85000272336. Its totient is φ = 71539937280.

The previous prime is 78215020259. The next prime is 78215020277. The reversal of 78215020273 is 37202051287.

It can be written as a sum of positive squares in 8 ways, for example, as 21383797824 + 56831222449 = 146232^2 + 238393^2 .

It is a cyclic number.

It is not a de Polignac number, because 78215020273 - 2¹³ = 78215012081 is a prime.

It is a super-2 number, since 2×78215020273² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78215020277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10457011 + ... + 10464487.

It is an arithmetic number, because the mean of its divisors is an integer number (5312517021).

Almost surely, 2^78215020273 is an apocalyptic number.

It is an amenable number.

78215020273 is a deficient number, since it is larger than the sum of its proper divisors (6785252063).

78215020273 is a wasteful number, since it uses less digits than its factorization.

78215020273 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14724.

The product of its (nonzero) digits is 47040, while the sum is 37.

The spelling of 78215020273 in words is "seventy-eight billion, two hundred fifteen million, twenty thousand, two hundred seventy-three".