78258047 has 6 divisors (see below), whose sum is σ = 91034928. Its totient is φ = 67078284.

The previous prime is 78258041. The next prime is 78258049. The reversal of 78258047 is 74085287.

It is not a de Polignac number, because 78258047 - 2¹⁴ = 78241663 is a prime.

It is a super-2 number, since 2×78258047² = 12248643840508418, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78257995 and 78258013.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78258041) 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 5 ways as a sum of consecutive naturals, for example, 798503 + ... + 798600.

It is an arithmetic number, because the mean of its divisors is an integer number (15172488).

Almost surely, 2^78258047 is an apocalyptic number.

78258047 is a deficient number, since it is larger than the sum of its proper divisors (12776881).

78258047 is a wasteful number, since it uses less digits than its factorization.

78258047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1597117 (or 1597110 counting only the distinct ones).

The product of its (nonzero) digits is 125440, while the sum is 41.

The square root of 78258047 is about 8846.3578381162. The cubic root of 78258047 is about 427.7365233555.

The spelling of 78258047 in words is "seventy-eight million, two hundred fifty-eight thousand, forty-seven".