678345249 has 16 divisors (see below), whose sum is σ = 911948544. Its totient is φ = 448502400.

The previous prime is 678345229. The next prime is 678345281. The reversal of 678345249 is 942543876.

It is not a de Polignac number, because 678345249 - 2⁸ = 678344993 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 678345198 and 678345207.

It is not an unprimeable number, because it can be changed into a prime (678345229) 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, 187639 + ... + 191219.

It is an arithmetic number, because the mean of its divisors is an integer number (56996784).

Almost surely, 2^678345249 is an apocalyptic number.

It is an amenable number.

678345249 is a deficient number, since it is larger than the sum of its proper divisors (233603295).

678345249 is a wasteful number, since it uses less digits than its factorization.

678345249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4088.

The product of its digits is 1451520, while the sum is 48.

The square root of 678345249 is about 26045.0618928042. The cubic root of 678345249 is about 878.6520552202.

The spelling of 678345249 in words is "six hundred seventy-eight million, three hundred forty-five thousand, two hundred forty-nine".