678488279616 has 189 divisors, whose sum is σ = 2262738163491. Its totient is φ = 193814256384.

The previous prime is 678488279593. The next prime is 678488279657. The reversal of 678488279616 is 616972884876.

The square root of 678488279616 is 823704.

It is a perfect power (a square), and thus also a powerful number.

678488279616 is a `hidden beast` number, since 6 + 78 + 488 + 2 + 79 + 6 + 1 + 6 = 666.

It is a super-2 number, since 2×678488279616² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 138379821 + ... + 138384723.

Almost surely, 2^678488279616 is an apocalyptic number.

678488279616 is the 823704-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 678488279616

678488279616 is an abundant number, since it is smaller than the sum of its proper divisors (1584249883875).

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

678488279616 is an frugal number, since it uses more digits than its factorization.

678488279616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9838 (or 4915 counting only the distinct ones).

The product of its digits is 390168576, while the sum is 72.

The spelling of 678488279616 in words is "six hundred seventy-eight billion, four hundred eighty-eight million, two hundred seventy-nine thousand, six hundred sixteen".