78380623 has 2 divisors, whose sum is σ = 78380624. Its totient is φ = 78380622.

The previous prime is 78380597. The next prime is 78380629. The reversal of 78380623 is 32608387.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78380623 is a prime.

It is a super-2 number, since 2×78380623² = 12287044123736258, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78380629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190311 + 39190312.

It is an arithmetic number, because the mean of its divisors is an integer number (39190312).

Almost surely, 2^78380623 is an apocalyptic number.

78380623 is a deficient number, since it is larger than the sum of its proper divisors (1).

78380623 is an equidigital number, since it uses as much as digits as its factorization.

78380623 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 78380623 is about 8853.2831763137. The cubic root of 78380623 is about 427.9597288659.

It can be divided in two parts, 78380 and 623, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 78380623 in words is "seventy-eight million, three hundred eighty thousand, six hundred twenty-three".