78499999 has 8 divisors (see below), whose sum is σ = 83453328. Its totient is φ = 73584000.

The previous prime is 78499997. The next prime is 78500003. The reversal of 78499999 is 99999487.

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

It is a cyclic number.

It is not a de Polignac number, because 78499999 - 2¹ = 78499997 is a prime.

It is a Duffinian number.

78499999 is a modest number, since divided by 9999 gives 7849 as remainder.

It is a self number, because there is not a number n which added to its sum of digits gives 78499999.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78499991) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4932 + ... + 13465.

It is an arithmetic number, because the mean of its divisors is an integer number (10431666).

Almost surely, 2^78499999 is an apocalyptic number.

78499999 is a deficient number, since it is larger than the sum of its proper divisors (4953329).

78499999 is a wasteful number, since it uses less digits than its factorization.

78499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18665.

The product of its digits is 13226976, while the sum is 64.

The square root of 78499999 is about 8860.0225169014. The cubic root of 78499999 is about 428.1768837541.

The spelling of 78499999 in words is "seventy-eight million, four hundred ninety-nine thousand, nine hundred ninety-nine".