78204799 has 2 divisors, whose sum is σ = 78204800. Its totient is φ = 78204798.

The previous prime is 78204787. The next prime is 78204809. The reversal of 78204799 is 99740287.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78204799 - 2⁵ = 78204767 is a prime.

It is a super-2 number, since 2×78204799² = 12231981173260802, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78204719) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39102399 + 39102400.

It is an arithmetic number, because the mean of its divisors is an integer number (39102400).

Almost surely, 2^78204799 is an apocalyptic number.

78204799 is a deficient number, since it is larger than the sum of its proper divisors (1).

78204799 is an equidigital number, since it uses as much as digits as its factorization.

78204799 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 78204799 is about 8843.3477258332. The cubic root of 78204799 is about 427.6394884692.

It can be divided in two parts, 78204 and 799, that added together give a triangular number (79003 = T₃₉₇).

The spelling of 78204799 in words is "seventy-eight million, two hundred four thousand, seven hundred ninety-nine".