78395140 has 24 divisors (see below), whose sum is σ = 173295360. Its totient is φ = 29707488.

The previous prime is 78395137. The next prime is 78395153. The reversal of 78395140 is 4159387.

It is a super-2 number, since 2×78395140² = 12291595951239200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78395140.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 102772 + ... + 103531.

It is an arithmetic number, because the mean of its divisors is an integer number (7220640).

Almost surely, 2^78395140 is an apocalyptic number.

It is an amenable number.

78395140 is an abundant number, since it is smaller than the sum of its proper divisors (94900220).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78395140 is a wasteful number, since it uses less digits than its factorization.

78395140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206331 (or 206329 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 37.

The square root of 78395140 is about 8854.1030036927. The cubic root of 78395140 is about 427.9861482692.

The spelling of 78395140 in words is "seventy-eight million, three hundred ninety-five thousand, one hundred forty".