78887747 has 4 divisors (see below), whose sum is σ = 79181280. Its totient is φ = 78594216.

The previous prime is 78887719. The next prime is 78887749. The reversal of 78887747 is 74778887.

It is a happy number.

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 78887747 - 2¹⁴ = 78871363 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78887692 and 78887701.

It is not an unprimeable number, because it can be changed into a prime (78887749) 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, 146363 + ... + 146900.

It is an arithmetic number, because the mean of its divisors is an integer number (19795320).

Almost surely, 2^78887747 is an apocalyptic number.

78887747 is a deficient number, since it is larger than the sum of its proper divisors (293533).

78887747 is a wasteful number, since it uses less digits than its factorization.

78887747 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 293532.

The product of its digits is 4917248, while the sum is 56.

The square root of 78887747 is about 8881.8774479273. The cubic root of 78887747 is about 428.8807144222.

The spelling of 78887747 in words is "seventy-eight million, eight hundred eighty-seven thousand, seven hundred forty-seven".