78204235 has 4 divisors (see below), whose sum is σ = 93845088. Its totient is φ = 62563384.

The previous prime is 78204221. The next prime is 78204239. The reversal of 78204235 is 53240287.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78204235 - 2⁷ = 78204107 is a prime.

It is a super-2 number, since 2×78204235² = 12231804743870450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 78204197 and 78204206.

It is not an unprimeable number, because it can be changed into a prime (78204239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7820419 + ... + 7820428.

It is an arithmetic number, because the mean of its divisors is an integer number (23461272).

Almost surely, 2^78204235 is an apocalyptic number.

78204235 is a deficient number, since it is larger than the sum of its proper divisors (15640853).

78204235 is a wasteful number, since it uses less digits than its factorization.

78204235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15640852.

The product of its (nonzero) digits is 13440, while the sum is 31.

The square root of 78204235 is about 8843.3158373995. The cubic root of 78204235 is about 427.6384604451.

The spelling of 78204235 in words is "seventy-eight million, two hundred four thousand, two hundred thirty-five".