78305828 has 12 divisors (see below), whose sum is σ = 137430300. Its totient is φ = 39040032.

The previous prime is 78305819. The next prime is 78305837. The reversal of 78305828 is 82850387.

It is an interprime number because it is at equal distance from previous prime (78305819) and next prime (78305837).

It can be written as a sum of positive squares in 2 ways, for example, as 37063744 + 41242084 = 6088^2 + 6422^2 .

It is a super-2 number, since 2×78305828² = 12263605397531168, which contains 22 as substring.

It is a hoax number, since the sum of its digits (41) coincides with the sum of the digits of its distinct prime factors.

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, 26651 + ... + 29442.

It is an arithmetic number, because the mean of its divisors is an integer number (11452525).

Almost surely, 2^78305828 is an apocalyptic number.

It is an amenable number.

78305828 is a deficient number, since it is larger than the sum of its proper divisors (59124472).

78305828 is a wasteful number, since it uses less digits than its factorization.

78305828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56446 (or 56444 counting only the distinct ones).

The product of its (nonzero) digits is 107520, while the sum is 41.

The square root of 78305828 is about 8849.0580289656. The cubic root of 78305828 is about 427.8235581571.

The spelling of 78305828 in words is "seventy-eight million, three hundred five thousand, eight hundred twenty-eight".