678286464 has 64 divisors (see below), whose sum is σ = 1806983040. Its totient is φ = 225432576.

The previous prime is 678286457. The next prime is 678286471. The reversal of 678286464 is 464682876.

It is an interprime number because it is at equal distance from previous prime (678286457) and next prime (678286471).

It is a tau number, because it is divible by the number of its divisors (64).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138522 + ... + 143334.

It is an arithmetic number, because the mean of its divisors is an integer number (28234110).

Almost surely, 2^678286464 is an apocalyptic number.

678286464 is a gapful number since it is divisible by the number (64) 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 678286464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903491520).

678286464 is an abundant number, since it is smaller than the sum of its proper divisors (1128696576).

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

678286464 is a wasteful number, since it uses less digits than its factorization.

678286464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5197 (or 5185 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 51.

The square root of 678286464 is about 26043.9333434871. The cubic root of 678286464 is about 878.6266733304.

The spelling of 678286464 in words is "six hundred seventy-eight million, two hundred eighty-six thousand, four hundred sixty-four".