78444487 has 16 divisors (see below), whose sum is σ = 87026688. Its totient is φ = 70116480.

The previous prime is 78444437. The next prime is 78444493.

78444487 is nontrivially palindromic in base 10.

It is a cyclic number.

It is not a de Polignac number, because 78444487 - 2¹⁵ = 78411719 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78444437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 277048 + ... + 277330.

It is an arithmetic number, because the mean of its divisors is an integer number (5439168).

Almost surely, 2^78444487 is an apocalyptic number.

78444487 is a deficient number, since it is larger than the sum of its proper divisors (8582201).

78444487 is a wasteful number, since it uses less digits than its factorization.

78444487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 630.

The product of its digits is 802816, while the sum is 46.

The square root of 78444487 is about 8856.8892394565. The cubic root of 78444487 is about 428.0759302064.

The spelling of 78444487 in words is "seventy-eight million, four hundred forty-four thousand, four hundred eighty-seven".