678755061 has 6 divisors (see below), whose sum is σ = 980423990. Its totient is φ = 452503368.

The previous prime is 678755023. The next prime is 678755083. The reversal of 678755061 is 160557876.

678755061 is a `hidden beast` number, since 6 + 78 + 75 + 506 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 677300625 + 1454436 = 26025^2 + 1206^2 .

It is not a de Polignac number, because 678755061 - 2¹¹ = 678753013 is a prime.

It is a super-2 number, since 2×678755061² = 921416865666227442, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 678754998 and 678755016.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (678759061) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 37708606 + ... + 37708623.

Almost surely, 2^678755061 is an apocalyptic number.

It is an amenable number.

678755061 is a deficient number, since it is larger than the sum of its proper divisors (301668929).

678755061 is a wasteful number, since it uses less digits than its factorization.

678755061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75417235 (or 75417232 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The square root of 678755061 is about 26052.9280696048. The cubic root of 678755061 is about 878.8289610403.

The spelling of 678755061 in words is "six hundred seventy-eight million, seven hundred fifty-five thousand, sixty-one".