78378045 has 16 divisors (see below), whose sum is σ = 125641152. Its totient is φ = 41722880.

The previous prime is 78378031. The next prime is 78378049. The reversal of 78378045 is 54087387.

It is not a de Polignac number, because 78378045 - 2⁷ = 78377917 is a prime.

It is a super-2 number, since 2×78378045² = 12286235876044050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 78377988 and 78378006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78378049) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3805 + ... + 13085.

It is an arithmetic number, because the mean of its divisors is an integer number (7852572).

Almost surely, 2^78378045 is an apocalyptic number.

It is an amenable number.

78378045 is a deficient number, since it is larger than the sum of its proper divisors (47263107).

78378045 is a wasteful number, since it uses less digits than its factorization.

78378045 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9852.

The product of its (nonzero) digits is 188160, while the sum is 42.

The square root of 78378045 is about 8853.1375794122. The cubic root of 78378045 is about 427.9550368377.

The spelling of 78378045 in words is "seventy-eight million, three hundred seventy-eight thousand, forty-five".