678037428 has 18 divisors (see below), whose sum is σ = 1713928034. Its totient is φ = 226012464.

The previous prime is 678037421. The next prime is 678037471. The reversal of 678037428 is 824730876.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 677456784 + 580644 = 26028^2 + 762^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678037421) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 9417151 + ... + 9417222.

Almost surely, 2^678037428 is an apocalyptic number.

It is an amenable number.

678037428 is an abundant number, since it is smaller than the sum of its proper divisors (1035890606).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

678037428 is a wasteful number, since it uses less digits than its factorization.

678037428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18834383 (or 18834378 counting only the distinct ones).

The product of its (nonzero) digits is 451584, while the sum is 45.

The square root of 678037428 is about 26039.1518295047. The cubic root of 678037428 is about 878.5191295573.

The spelling of 678037428 in words is "six hundred seventy-eight million, thirty-seven thousand, four hundred twenty-eight".