78743669 has 8 divisors (see below), whose sum is σ = 79552800. Its totient is φ = 77938576.

The previous prime is 78743663. The next prime is 78743699. The reversal of 78743669 is 96634787.

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 78743669 - 2⁴ = 78743653 is a prime.

It is a super-2 number, since 2×78743669² = 12401130815163122, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78743663) 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, 50942 + ... + 52464.

It is an arithmetic number, because the mean of its divisors is an integer number (9944100).

Almost surely, 2^78743669 is an apocalyptic number.

It is an amenable number.

78743669 is a deficient number, since it is larger than the sum of its proper divisors (809131).

78743669 is a wasteful number, since it uses less digits than its factorization.

78743669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2019.

The product of its digits is 1524096, while the sum is 50.

The square root of 78743669 is about 8873.7629560407. The cubic root of 78743669 is about 428.6194574057.

The spelling of 78743669 in words is "seventy-eight million, seven hundred forty-three thousand, six hundred sixty-nine".