678528949 has 16 divisors (see below), whose sum is σ = 808486272. Its totient is φ = 557339328.

The previous prime is 678528923. The next prime is 678528959. The reversal of 678528949 is 949825876.

678528949 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 678528949 - 2¹⁹ = 678004661 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678528893 and 678528902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678528959) 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, 5314 + ... + 37219.

It is an arithmetic number, because the mean of its divisors is an integer number (50530392).

Almost surely, 2^678528949 is an apocalyptic number.

It is an amenable number.

678528949 is a deficient number, since it is larger than the sum of its proper divisors (129957323).

678528949 is a wasteful number, since it uses less digits than its factorization.

678528949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42636.

The product of its digits is 8709120, while the sum is 58.

The square root of 678528949 is about 26048.5882342978. The cubic root of 678528949 is about 878.7313628269.

The spelling of 678528949 in words is "six hundred seventy-eight million, five hundred twenty-eight thousand, nine hundred forty-nine".