78889749 has 8 divisors (see below), whose sum is σ = 105422400. Its totient is φ = 52475136.

The previous prime is 78889703. The next prime is 78889763. The reversal of 78889749 is 94798887.

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

It is not a de Polignac number, because 78889749 - 2⁷ = 78889621 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78889692 and 78889701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78889849) 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, 27937 + ... + 30630.

It is an arithmetic number, because the mean of its divisors is an integer number (13177800).

Almost surely, 2^78889749 is an apocalyptic number.

It is an amenable number.

78889749 is a deficient number, since it is larger than the sum of its proper divisors (26532651).

78889749 is a wasteful number, since it uses less digits than its factorization.

78889749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59019.

The product of its digits is 8128512, while the sum is 60.

The square root of 78889749 is about 8881.9901486097. The cubic root of 78889749 is about 428.8843424124.

The spelling of 78889749 in words is "seventy-eight million, eight hundred eighty-nine thousand, seven hundred forty-nine".