78799669 has 8 divisors (see below), whose sum is σ = 89327840. Its totient is φ = 68909616.

The previous prime is 78799661. The next prime is 78799673. The reversal of 78799669 is 96699787.

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 78799669 - 2³ = 78799661 is a prime.

It is a super-2 number, since 2×78799669² = 12418775669019122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78799661) 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, 159267 + ... + 159760.

It is an arithmetic number, because the mean of its divisors is an integer number (11165980).

Almost surely, 2^78799669 is an apocalyptic number.

It is an amenable number.

78799669 is a deficient number, since it is larger than the sum of its proper divisors (10528171).

78799669 is a wasteful number, since it uses less digits than its factorization.

78799669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 319059.

The product of its digits is 10287648, while the sum is 61.

The square root of 78799669 is about 8876.9177646298. The cubic root of 78799669 is about 428.7210401834.

The spelling of 78799669 in words is "seventy-eight million, seven hundred ninety-nine thousand, six hundred sixty-nine".