78248147 has 2 divisors, whose sum is σ = 78248148. Its totient is φ = 78248146.

The previous prime is 78248143. The next prime is 78248171. The reversal of 78248147 is 74184287.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78248147 - 2² = 78248143 is a prime.

It is a super-2 number, since 2×78248147² = 12245545017867218, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78248141) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39124073 + 39124074.

It is an arithmetic number, because the mean of its divisors is an integer number (39124074).

Almost surely, 2^78248147 is an apocalyptic number.

78248147 is a deficient number, since it is larger than the sum of its proper divisors (1).

78248147 is an equidigital number, since it uses as much as digits as its factorization.

78248147 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 100352, while the sum is 41.

The square root of 78248147 is about 8845.7982681045. The cubic root of 78248147 is about 427.7184857210.

The spelling of 78248147 in words is "seventy-eight million, two hundred forty-eight thousand, one hundred forty-seven".