678743640 has 96 divisors (see below), whose sum is σ = 2210036400. Its totient is φ = 180660480.

The previous prime is 678743627. The next prime is 678743657. The reversal of 678743640 is 46347876.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235810 + ... + 238670.

Almost surely, 2^678743640 is an apocalyptic number.

678743640 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 678743640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1105018200).

678743640 is an abundant number, since it is smaller than the sum of its proper divisors (1531292760).

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

678743640 is a wasteful number, since it uses less digits than its factorization.

678743640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3537 (or 3530 counting only the distinct ones).

The product of its (nonzero) digits is 677376, while the sum is 45.

The square root of 678743640 is about 26052.7088802681. The cubic root of 678743640 is about 878.8240318385.

The spelling of 678743640 in words is "six hundred seventy-eight million, seven hundred forty-three thousand, six hundred forty".