78247 has 6 divisors (see below), whose sum is σ = 84912. Its totient is φ = 72072.

The previous prime is 78241. The next prime is 78259. The reversal of 78247 is 74287.

It is a de Polignac number, because none of the positive numbers 2^k-78247 is a prime.

It is a super-2 number, since 2×78247² = 12245186018, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 63 + ... + 400.

It is an arithmetic number, because the mean of its divisors is an integer number (14152).

2⁷⁸²⁴⁷ is an apocalyptic number.

78247 is the 162-nd hex number.

78247 is a deficient number, since it is larger than the sum of its proper divisors (6665).

78247 is a wasteful number, since it uses less digits than its factorization.

78247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 476 counting only the distinct ones).

The product of its digits is 3136, while the sum is 28.

The square root of 78247 is about 279.7266522876. The cubic root of 78247 is about 42.7716395808.

It can be divided in two parts, 78 and 247, that added together give a triangular number (325 = T₂₅).

The spelling of 78247 in words is "seventy-eight thousand, two hundred forty-seven".