78996647 has 4 divisors (see below), whose sum is σ = 80291736. Its totient is φ = 77701560.

The previous prime is 78996641. The next prime is 78996677. The reversal of 78996647 is 74669987.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78996647 - 2¹⁸ = 78734503 is a prime.

It is a super-3 number, since 3×78996647³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 78996592 and 78996601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78996641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647453 + ... + 647574.

It is an arithmetic number, because the mean of its divisors is an integer number (20072934).

Almost surely, 2^78996647 is an apocalyptic number.

78996647 is a deficient number, since it is larger than the sum of its proper divisors (1295089).

78996647 is a wasteful number, since it uses less digits than its factorization.

78996647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1295088.

The product of its digits is 4572288, while the sum is 56.

The square root of 78996647 is about 8888.0057943275. The cubic root of 78996647 is about 429.0779720733.

The spelling of 78996647 in words is "seventy-eight million, nine hundred ninety-six thousand, six hundred forty-seven".