78653999 has 2 divisors, whose sum is σ = 78654000. Its totient is φ = 78653998.

The previous prime is 78653969. The next prime is 78654049. The reversal of 78653999 is 99935687.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78653999 - 2²⁴ = 61876783 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78653929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39326999 + 39327000.

It is an arithmetic number, because the mean of its divisors is an integer number (39327000).

Almost surely, 2^78653999 is an apocalyptic number.

78653999 is a deficient number, since it is larger than the sum of its proper divisors (1).

78653999 is an equidigital number, since it uses as much as digits as its factorization.

78653999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3674160, while the sum is 56.

The square root of 78653999 is about 8868.7089815824. The cubic root of 78653999 is about 428.4566976326.

The spelling of 78653999 in words is "seventy-eight million, six hundred fifty-three thousand, nine hundred ninety-nine".