687478428 has 180 divisors, whose sum is σ = 2252118792. Its totient is φ = 181258560.

The previous prime is 687478427. The next prime is 687478457. The reversal of 687478428 is 824874786.

It is a happy number.

687478428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (687478427) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 204723 + ... + 208053.

Almost surely, 2^687478428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 687478428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1126059396).

687478428 is an abundant number, since it is smaller than the sum of its proper divisors (1564640364).

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

687478428 is a wasteful number, since it uses less digits than its factorization.

687478428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3374 (or 3356 counting only the distinct ones).

The product of its digits is 4816896, while the sum is 54.

The square root of 687478428 is about 26219.8098391274. The cubic root of 687478428 is about 882.5778526229.

The spelling of 687478428 in words is "six hundred eighty-seven million, four hundred seventy-eight thousand, four hundred twenty-eight".