78378105 has 16 divisors (see below), whose sum is σ = 135051840. Its totient is φ = 38586048.

The previous prime is 78378103. The next prime is 78378119. The reversal of 78378105 is 50187387.

It is not a de Polignac number, because 78378105 - 2¹ = 78378103 is a prime.

It is a super-2 number, since 2×78378105² = 12286254686782050, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (78378103) 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, 200775 + ... + 201164.

It is an arithmetic number, because the mean of its divisors is an integer number (8440740).

Almost surely, 2^78378105 is an apocalyptic number.

It is an amenable number.

78378105 is a deficient number, since it is larger than the sum of its proper divisors (56673735).

78378105 is a wasteful number, since it uses less digits than its factorization.

78378105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401960.

The product of its (nonzero) digits is 47040, while the sum is 39.

The square root of 78378105 is about 8853.1409680407. The cubic root of 78378105 is about 427.9551460405.

The spelling of 78378105 in words is "seventy-eight million, three hundred seventy-eight thousand, one hundred five".