78303493 has 2 divisors, whose sum is σ = 78303494. Its totient is φ = 78303492.

The previous prime is 78303469. The next prime is 78303527. The reversal of 78303493 is 39430387.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53919649 + 24383844 = 7343^2 + 4938^2 .

It is an emirp because it is prime and its reverse (39430387) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78303493 - 2⁹ = 78302981 is a prime.

It is a super-2 number, since 2×78303493² = 12262874032002098, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78303403) 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, 39151746 + 39151747.

It is an arithmetic number, because the mean of its divisors is an integer number (39151747).

Almost surely, 2^78303493 is an apocalyptic number.

It is an amenable number.

78303493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78303493 is an equidigital number, since it uses as much as digits as its factorization.

78303493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 37.

The square root of 78303493 is about 8848.9260930352. The cubic root of 78303493 is about 427.8193056940.

The spelling of 78303493 in words is "seventy-eight million, three hundred three thousand, four hundred ninety-three".