78307828 has 12 divisors (see below), whose sum is σ = 139954752. Its totient is φ = 38320760.

The previous prime is 78307813. The next prime is 78307841. The reversal of 78307828 is 82870387.

It is a super-2 number, since 2×78307828² = 12264231852155168, which contains 22 as substring.

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, 208078 + ... + 208453.

It is an arithmetic number, because the mean of its divisors is an integer number (11662896).

Almost surely, 2^78307828 is an apocalyptic number.

It is an amenable number.

78307828 is a deficient number, since it is larger than the sum of its proper divisors (61646924).

78307828 is a wasteful number, since it uses less digits than its factorization.

78307828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 416582 (or 416580 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 78307828 is about 8849.1710346224. The cubic root of 78307828 is about 427.8272004566.

The spelling of 78307828 in words is "seventy-eight million, three hundred seven thousand, eight hundred twenty-eight".