678515652 has 36 divisors (see below), whose sum is σ = 1715956060. Its totient is φ = 226063872.

The previous prime is 678515623. The next prime is 678515681. The reversal of 678515652 is 256515876.

678515652 is a `hidden beast` number, since 6 + 7 + 85 + 1 + 565 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (678515623) and next prime (678515681).

It can be written as a sum of positive squares in 2 ways, for example, as 638370756 + 40144896 = 25266^2 + 6336^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 678515598 and 678515607.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 116424 + ... + 122112.

Almost surely, 2^678515652 is an apocalyptic number.

It is an amenable number.

678515652 is an abundant number, since it is smaller than the sum of its proper divisors (1037440408).

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

678515652 is a wasteful number, since it uses less digits than its factorization.

678515652 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9012 (or 9007 counting only the distinct ones).

The product of its digits is 504000, while the sum is 45.

The square root of 678515652 is about 26048.3329984857. The cubic root of 678515652 is about 878.7256226801.

The spelling of 678515652 in words is "six hundred seventy-eight million, five hundred fifteen thousand, six hundred fifty-two".