78204605 has 4 divisors (see below), whose sum is σ = 93845532. Its totient is φ = 62563680.

The previous prime is 78204593. The next prime is 78204617. The reversal of 78204605 is 50640287.

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

It is an interprime number because it is at equal distance from previous prime (78204593) and next prime (78204617).

It can be written as a sum of positive squares in 2 ways, for example, as 47045881 + 31158724 = 6859^2 + 5582^2 .

It is not a de Polignac number, because 78204605 - 2⁶ = 78204541 is a prime.

It is a super-2 number, since 2×78204605² = 12231920486412050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7820456 + ... + 7820465.

It is an arithmetic number, because the mean of its divisors is an integer number (23461383).

Almost surely, 2^78204605 is an apocalyptic number.

It is an amenable number.

78204605 is a deficient number, since it is larger than the sum of its proper divisors (15640927).

78204605 is a wasteful number, since it uses less digits than its factorization.

78204605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15640926.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 78204605 is about 8843.3367571296. The cubic root of 78204605 is about 427.6391348586.

The spelling of 78204605 in words is "seventy-eight million, two hundred four thousand, six hundred five".