78251645 has 16 divisors (see below), whose sum is σ = 96222720. Its totient is φ = 61072704.

The previous prime is 78251627. The next prime is 78251651. The reversal of 78251645 is 54615287.

It is a cyclic number.

It is not a de Polignac number, because 78251645 - 2⁶ = 78251581 is a prime.

It is a super-2 number, since 2×78251645² = 12246639890412050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 78251599 and 78251608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35444 + ... + 37586.

It is an arithmetic number, because the mean of its divisors is an integer number (6013920).

Almost surely, 2^78251645 is an apocalyptic number.

It is an amenable number.

78251645 is a deficient number, since it is larger than the sum of its proper divisors (17971075).

78251645 is a wasteful number, since it uses less digits than its factorization.

78251645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2324.

The product of its digits is 67200, while the sum is 38.

The square root of 78251645 is about 8845.9959868858. The cubic root of 78251645 is about 427.7248591923.

The spelling of 78251645 in words is "seventy-eight million, two hundred fifty-one thousand, six hundred forty-five".