78253699 has 2 divisors, whose sum is σ = 78253700. Its totient is φ = 78253698.

The previous prime is 78253691. The next prime is 78253709. The reversal of 78253699 is 99635287.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78253699 - 2³ = 78253691 is a prime.

It is a super-2 number, since 2×78253699² = 12247282814365202, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78253691) 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, 39126849 + 39126850.

It is an arithmetic number, because the mean of its divisors is an integer number (39126850).

Almost surely, 2^78253699 is an apocalyptic number.

78253699 is a deficient number, since it is larger than the sum of its proper divisors (1).

78253699 is an equidigital number, since it uses as much as digits as its factorization.

78253699 is an odious number, because the sum of its binary digits is odd.

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

The square root of 78253699 is about 8846.1120838479. The cubic root of 78253699 is about 427.7286015596.

The spelling of 78253699 in words is "seventy-eight million, two hundred fifty-three thousand, six hundred ninety-nine".