78206513 has 16 divisors (see below), whose sum is σ = 97818624. Its totient is φ = 60743760.

The previous prime is 78206507. The next prime is 78206549. The reversal of 78206513 is 31560287.

It is a happy number.

It is not a de Polignac number, because 78206513 - 2⁸ = 78206257 is a prime.

It is a super-2 number, since 2×78206513² = 12232517351238338, which contains 22 as substring.

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 78206513.

It is not an unprimeable number, because it can be changed into a prime (78206563) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25256 + ... + 28182.

It is an arithmetic number, because the mean of its divisors is an integer number (6113664).

Almost surely, 2^78206513 is an apocalyptic number.

It is an amenable number.

78206513 is a deficient number, since it is larger than the sum of its proper divisors (19612111).

78206513 is a wasteful number, since it uses less digits than its factorization.

78206513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3292.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 78206513 is about 8843.4446343040. Note that the first 3 decimals coincide. The cubic root of 78206513 is about 427.6426126113.

The spelling of 78206513 in words is "seventy-eight million, two hundred six thousand, five hundred thirteen".