78645288405 has 16 divisors (see below), whose sum is σ = 126386794944. Its totient is φ = 41759376000.

The previous prime is 78645288389. The next prime is 78645288409. The reversal of 78645288405 is 50488254687.

It is not a de Polignac number, because 78645288405 - 2⁴ = 78645288389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78645288409) 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, 11545096 + ... + 11551905.

It is an arithmetic number, because the mean of its divisors is an integer number (7899174684).

Almost surely, 2^78645288405 is an apocalyptic number.

It is an amenable number.

78645288405 is a deficient number, since it is larger than the sum of its proper divisors (47741506539).

78645288405 is a wasteful number, since it uses less digits than its factorization.

78645288405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23097236.

The product of its (nonzero) digits is 17203200, while the sum is 57.

The spelling of 78645288405 in words is "seventy-eight billion, six hundred forty-five million, two hundred eighty-eight thousand, four hundred five".