78244287 has 24 divisors (see below), whose sum is σ = 115167360. Its totient is φ = 47216400.

The previous prime is 78244249. The next prime is 78244297.

78244287 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 78244287 - 2²⁰ = 77195711 is a prime.

It is a super-2 number, since 2×78244287² = 12244336896276738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78244297) 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 23 ways as a sum of consecutive naturals, for example, 159112 + ... + 159602.

It is an arithmetic number, because the mean of its divisors is an integer number (4798640).

Almost surely, 2^78244287 is an apocalyptic number.

78244287 is a deficient number, since it is larger than the sum of its proper divisors (36923073).

78244287 is a wasteful number, since it uses less digits than its factorization.

78244287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 955 (or 944 counting only the distinct ones).

The product of its digits is 200704, while the sum is 42.

The square root of 78244287 is about 8845.5800827306. The cubic root of 78244287 is about 427.7114524532.

The spelling of 78244287 in words is "seventy-eight million, two hundred forty-four thousand, two hundred eighty-seven".