78305000 has 40 divisors (see below), whose sum is σ = 183480330. Its totient is φ = 31320000.

The previous prime is 78304991. The next prime is 78305011. The reversal of 78305000 is 50387.

It can be written as a sum of positive squares in 5 ways, for example, as 15038884 + 63266116 = 3878^2 + 7954^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×78305000² = 12263346050000000, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 2831 + ... + 12830.

Almost surely, 2^78305000 is an apocalyptic number.

It is an amenable number.

78305000 is an abundant number, since it is smaller than the sum of its proper divisors (105175330).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78305000 is a wasteful number, since it uses less digits than its factorization.

78305000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15687 (or 15668 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 78305000 is about 8849.0112442012. The cubic root of 78305000 is about 427.8220502270.

Adding to 78305000 its reverse (50387), we get a palindrome (78355387).

The spelling of 78305000 in words is "seventy-eight million, three hundred five thousand".