78006509 has 8 divisors (see below), whose sum is σ = 92026368. Its totient is φ = 64705680.

The previous prime is 78006497. The next prime is 78006521. The reversal of 78006509 is 90560087.

It is an interprime number because it is at equal distance from previous prime (78006497) and next prime (78006521).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-78006509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78006569) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 179522 + ... + 179955.

It is an arithmetic number, because the mean of its divisors is an integer number (11503296).

Almost surely, 2^78006509 is an apocalyptic number.

It is an amenable number.

78006509 is a deficient number, since it is larger than the sum of its proper divisors (14019859).

78006509 is a wasteful number, since it uses less digits than its factorization.

78006509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 359515.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 78006509 is about 8832.1293582012. The cubic root of 78006509 is about 427.2777527689.

The spelling of 78006509 in words is "seventy-eight million, six thousand, five hundred nine".