678064240 has 160 divisors (see below), whose sum is σ = 1879879680. Its totient is φ = 222566400.

The previous prime is 678064237. The next prime is 678064249. The reversal of 678064240 is 42460876.

It is a super-2 number, since 2×678064240² = 919542227133555200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 678064240.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678064249) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2412900 + ... + 2413180.

It is an arithmetic number, because the mean of its divisors is an integer number (11749248).

Almost surely, 2^678064240 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 678064240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (939939840).

678064240 is an abundant number, since it is smaller than the sum of its proper divisors (1201815440).

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

678064240 is a wasteful number, since it uses less digits than its factorization.

678064240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 471 (or 465 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 37.

The square root of 678064240 is about 26039.6666645332. Note that the first 5 decimals coincide. The cubic root of 678064240 is about 878.5307093234.

The spelling of 678064240 in words is "six hundred seventy-eight million, sixty-four thousand, two hundred forty".