678535780 has 24 divisors (see below), whose sum is σ = 1534535352. Its totient is φ = 250536192.

The previous prime is 678535717. The next prime is 678535783. The reversal of 678535780 is 87535876.

It can be written as a sum of positive squares in 4 ways, for example, as 55234624 + 623301156 = 7432^2 + 24966^2 .

It is not an unprimeable number, because it can be changed into a prime (678535783) 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, 1304617 + ... + 1305136.

It is an arithmetic number, because the mean of its divisors is an integer number (63938973).

Almost surely, 2^678535780 is an apocalyptic number.

It is an amenable number.

678535780 is an abundant number, since it is smaller than the sum of its proper divisors (855999572).

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

678535780 is a wasteful number, since it uses less digits than its factorization.

678535780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2609775 (or 2609773 counting only the distinct ones).

The product of its (nonzero) digits is 1411200, while the sum is 49.

The square root of 678535780 is about 26048.7193543176. The cubic root of 678535780 is about 878.7343116541.

The spelling of 678535780 in words is "six hundred seventy-eight million, five hundred thirty-five thousand, seven hundred eighty".