78287497 has 2 divisors, whose sum is σ = 78287498. Its totient is φ = 78287496.

The previous prime is 78287483. The next prime is 78287527. The reversal of 78287497 is 79478287.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60512841 + 17774656 = 7779^2 + 4216^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78287497 is a prime.

It is a super-2 number, since 2×78287497² = 12257864373050018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78257497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39143748 + 39143749.

It is an arithmetic number, because the mean of its divisors is an integer number (39143749).

Almost surely, 2^78287497 is an apocalyptic number.

It is an amenable number.

78287497 is a deficient number, since it is larger than the sum of its proper divisors (1).

78287497 is an equidigital number, since it uses as much as digits as its factorization.

78287497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1580544, while the sum is 52.

The square root of 78287497 is about 8848.0222083808. The cubic root of 78287497 is about 427.7901717716.

The spelling of 78287497 in words is "seventy-eight million, two hundred eighty-seven thousand, four hundred ninety-seven".