678122532 has 36 divisors (see below), whose sum is σ = 1760474716. Its totient is φ = 219931200.

The previous prime is 678122527. The next prime is 678122563. The reversal of 678122532 is 235221876.

It can be written as a sum of positive squares in 2 ways, for example, as 236113956 + 442008576 = 15366^2 + 21024^2 .

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

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 253219 + ... + 255882.

Almost surely, 2^678122532 is an apocalyptic number.

It is an amenable number.

678122532 is an abundant number, since it is smaller than the sum of its proper divisors (1082352184).

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

678122532 is a wasteful number, since it uses less digits than its factorization.

678122532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 509148 (or 509143 counting only the distinct ones).

The product of its digits is 40320, while the sum is 36.

The square root of 678122532 is about 26040.7859328400. The cubic root of 678122532 is about 878.5558838529. Note that the first 3 decimals are identical.

The spelling of 678122532 in words is "six hundred seventy-eight million, one hundred twenty-two thousand, five hundred thirty-two".