678904380 has 432 divisors, whose sum is σ = 2665371072. Its totient is φ = 136857600.

The previous prime is 678904357. The next prime is 678904381. The reversal of 678904380 is 83409876.

It is a happy number.

It is a super-2 number, since 2×678904380² = 921822314366368800, which contains 22 as substring.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678904381) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 9300024 + ... + 9300096.

Almost surely, 2^678904380 is an apocalyptic number.

678904380 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678904380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1332685536).

678904380 is an abundant number, since it is smaller than the sum of its proper divisors (1986466692).

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

678904380 is a wasteful number, since it uses less digits than its factorization.

678904380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178 (or 162 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 678904380 is about 26055.7935975859. The cubic root of 678904380 is about 878.8934007022.

The spelling of 678904380 in words is "six hundred seventy-eight million, nine hundred four thousand, three hundred eighty".