78820445 has 16 divisors (see below), whose sum is σ = 106513920. Its totient is φ = 55473600.

The previous prime is 78820439. The next prime is 78820451. The reversal of 78820445 is 54402887.

It is an interprime number because it is at equal distance from previous prime (78820439) and next prime (78820451).

It is a de Polignac number, because none of the positive numbers 2^k-78820445 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 78820399 and 78820408.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21410 + ... + 24819.

It is an arithmetic number, because the mean of its divisors is an integer number (6657120).

Almost surely, 2^78820445 is an apocalyptic number.

It is an amenable number.

78820445 is a deficient number, since it is larger than the sum of its proper divisors (27693475).

78820445 is a wasteful number, since it uses less digits than its factorization.

78820445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46276.

The product of its (nonzero) digits is 71680, while the sum is 38.

The square root of 78820445 is about 8878.0879135093. The cubic root of 78820445 is about 428.7587151540.

The spelling of 78820445 in words is "seventy-eight million, eight hundred twenty thousand, four hundred forty-five".