678392145 has 32 divisors (see below), whose sum is σ = 1213468800. Its totient is φ = 359577792.

The previous prime is 678392137. The next prime is 678392147. The reversal of 678392145 is 541293876.

678392145 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 678392145 - 2³ = 678392137 is a prime.

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 678392145.

It is not an unprimeable number, because it can be changed into a prime (678392147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6591 + ... + 37419.

It is an arithmetic number, because the mean of its divisors is an integer number (37920900).

Almost surely, 2^678392145 is an apocalyptic number.

It is an amenable number.

678392145 is a deficient number, since it is larger than the sum of its proper divisors (535076655).

678392145 is a wasteful number, since it uses less digits than its factorization.

678392145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31006 (or 31000 counting only the distinct ones).

The product of its digits is 362880, while the sum is 45.

The square root of 678392145 is about 26045.9621630686. The cubic root of 678392145 is about 878.6723026863.

The spelling of 678392145 in words is "six hundred seventy-eight million, three hundred ninety-two thousand, one hundred forty-five".