78386445 has 48 divisors (see below), whose sum is σ = 142152192. Its totient is φ = 39911040.

The previous prime is 78386443. The next prime is 78386453. The reversal of 78386445 is 54468387.

It is not a de Polignac number, because 78386445 - 2¹ = 78386443 is a prime.

It is a super-2 number, since 2×78386445² = 12288869519476050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 78386445.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78386443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 115447 + ... + 116123.

It is an arithmetic number, because the mean of its divisors is an integer number (2961504).

Almost surely, 2^78386445 is an apocalyptic number.

It is an amenable number.

78386445 is a deficient number, since it is larger than the sum of its proper divisors (63765747).

78386445 is a wasteful number, since it uses less digits than its factorization.

78386445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 799 counting only the distinct ones).

The product of its digits is 645120, while the sum is 45.

The square root of 78386445 is about 8853.6119747818. The cubic root of 78386445 is about 427.9703246814.

The spelling of 78386445 in words is "seventy-eight million, three hundred eighty-six thousand, four hundred forty-five".