78304487 has 2 divisors, whose sum is σ = 78304488. Its totient is φ = 78304486.

The previous prime is 78304451. The next prime is 78304531. The reversal of 78304487 is 78440387.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78304487 - 2⁶ = 78304423 is a prime.

It is a super-2 number, since 2×78304487² = 12263185368666338, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78304427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39152243 + 39152244.

It is an arithmetic number, because the mean of its divisors is an integer number (39152244).

Almost surely, 2^78304487 is an apocalyptic number.

78304487 is a deficient number, since it is larger than the sum of its proper divisors (1).

78304487 is an equidigital number, since it uses as much as digits as its factorization.

78304487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 78304487 is about 8848.9822578645. The cubic root of 78304487 is about 427.8211159606.

The spelling of 78304487 in words is "seventy-eight million, three hundred four thousand, four hundred eighty-seven".