678240080 has 160 divisors (see below), whose sum is σ = 1871023104. Its totient is φ = 223838208.

The previous prime is 678240053. The next prime is 678240083. The reversal of 678240080 is 80042876.

It is a super-2 number, since 2×678240080² = 920019212236812800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a self number, because there is not a number n which added to its sum of digits gives 678240080.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678240083) 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, 1921184 + ... + 1921536.

Almost surely, 2^678240080 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 678240080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935511552).

678240080 is an abundant number, since it is smaller than the sum of its proper divisors (1192783024).

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

678240080 is a wasteful number, since it uses less digits than its factorization.

678240080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 35.

The square root of 678240080 is about 26043.0428329717. The cubic root of 678240080 is about 878.6066448464.

The spelling of 678240080 in words is "six hundred seventy-eight million, two hundred forty thousand, eighty".