78562993 has 2 divisors, whose sum is σ = 78562994. Its totient is φ = 78562992.

The previous prime is 78562987. The next prime is 78562997. The reversal of 78562993 is 39926587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 73753744 + 4809249 = 8588^2 + 2193^2 .

It is a cyclic number.

It is not a de Polignac number, because 78562993 - 2⁵ = 78562961 is a prime.

It is not a weakly prime, because it can be changed into another prime (78562997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39281496 + 39281497.

It is an arithmetic number, because the mean of its divisors is an integer number (39281497).

Almost surely, 2^78562993 is an apocalyptic number.

It is an amenable number.

78562993 is a deficient number, since it is larger than the sum of its proper divisors (1).

78562993 is an equidigital number, since it uses as much as digits as its factorization.

78562993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 816480, while the sum is 49.

The square root of 78562993 is about 8863.5767611050. The cubic root of 78562993 is about 428.2913863582.

The spelling of 78562993 in words is "seventy-eight million, five hundred sixty-two thousand, nine hundred ninety-three".