78008327640 has 128 divisors (see below), whose sum is σ = 263690380800. Its totient is φ = 20509211520.

The previous prime is 78008327603. The next prime is 78008327641. The reversal of 78008327640 is 4672380087.

It is a happy number.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78008327641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 431982 + ... + 585341.

It is an arithmetic number, because the mean of its divisors is an integer number (2060081100).

Almost surely, 2^78008327640 is an apocalyptic number.

It is an amenable number.

78008327640 is an abundant number, since it is smaller than the sum of its proper divisors (185682053160).

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

78008327640 is a wasteful number, since it uses less digits than its factorization.

78008327640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1017414 (or 1017404 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The spelling of 78008327640 in words is "seventy-eight billion, eight million, three hundred twenty-seven thousand, six hundred forty".