78071247 has 12 divisors (see below), whose sum is σ = 118705080. Its totient is φ = 49308048.

The previous prime is 78071239. The next prime is 78071249. The reversal of 78071247 is 74217087.

It is not a de Polignac number, because 78071247 - 2³ = 78071239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78071249) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 228108 + ... + 228449.

It is an arithmetic number, because the mean of its divisors is an integer number (9892090).

Almost surely, 2^78071247 is an apocalyptic number.

78071247 is a deficient number, since it is larger than the sum of its proper divisors (40633833).

78071247 is a wasteful number, since it uses less digits than its factorization.

78071247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456582 (or 456579 counting only the distinct ones).

The product of its (nonzero) digits is 21952, while the sum is 36.

The square root of 78071247 is about 8835.7935127525. The cubic root of 78071247 is about 427.3959200817.

It can be divided in two parts, 780 and 71247, that added together give a palindrome (72027).

The spelling of 78071247 in words is "seventy-eight million, seventy-one thousand, two hundred forty-seven".