78645499 has 2 divisors, whose sum is σ = 78645500. Its totient is φ = 78645498.

The previous prime is 78645449. The next prime is 78645517. The reversal of 78645499 is 99454687.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78645499 - 2¹⁵ = 78612731 is a prime.

It is a super-2 number, since 2×78645499² = 12370229025918002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78645449) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39322749 + 39322750.

It is an arithmetic number, because the mean of its divisors is an integer number (39322750).

Almost surely, 2^78645499 is an apocalyptic number.

78645499 is a deficient number, since it is larger than the sum of its proper divisors (1).

78645499 is an equidigital number, since it uses as much as digits as its factorization.

78645499 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 52.

The square root of 78645499 is about 8868.2297557066. The cubic root of 78645499 is about 428.4412628881.

The spelling of 78645499 in words is "seventy-eight million, six hundred forty-five thousand, four hundred ninety-nine".