678480781 has 8 divisors (see below), whose sum is σ = 765684000. Its totient is φ = 595531440.

The previous prime is 678480773. The next prime is 678480791. The reversal of 678480781 is 187084876.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 678480781 - 2³ = 678480773 is a prime.

It is a super-2 number, since 2×678480781² = 920672340372739922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678480791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1063131 + ... + 1063768.

It is an arithmetic number, because the mean of its divisors is an integer number (95710500).

Almost surely, 2^678480781 is an apocalyptic number.

It is an amenable number.

678480781 is a deficient number, since it is larger than the sum of its proper divisors (87203219).

678480781 is a wasteful number, since it uses less digits than its factorization.

678480781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2126939.

The product of its (nonzero) digits is 602112, while the sum is 49.

The square root of 678480781 is about 26047.6636380310. The cubic root of 678480781 is about 878.7105689541.

It can be divided in two parts, 67 and 8480781, that added together give a palindrome (8480848).

The spelling of 678480781 in words is "six hundred seventy-eight million, four hundred eighty thousand, seven hundred eighty-one".