78438849 has 8 divisors (see below), whose sum is σ = 104773152. Its totient is φ = 52198560.

The previous prime is 78438847. The next prime is 78438851. The reversal of 78438849 is 94883487.

It is an interprime number because it is at equal distance from previous prime (78438847) and next prime (78438851).

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

It is not a de Polignac number, because 78438849 - 2¹ = 78438847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (78438847) 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, 21532 + ... + 24909.

It is an arithmetic number, because the mean of its divisors is an integer number (13096644).

Almost surely, 2^78438849 is an apocalyptic number.

It is an amenable number.

78438849 is a deficient number, since it is larger than the sum of its proper divisors (26334303).

78438849 is a wasteful number, since it uses less digits than its factorization.

78438849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47007.

The product of its digits is 1548288, while the sum is 51.

The square root of 78438849 is about 8856.5709504300. The cubic root of 78438849 is about 428.0656743341.

The spelling of 78438849 in words is "seventy-eight million, four hundred thirty-eight thousand, eight hundred forty-nine".