678571636 has 12 divisors (see below), whose sum is σ = 1188123300. Its totient is φ = 339107840.

The previous prime is 678571613. The next prime is 678571661. The reversal of 678571636 is 636175876.

It can be written as a sum of positive squares in 2 ways, for example, as 639584100 + 38987536 = 25290^2 + 6244^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 678571636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35725 + ... + 51316.

It is an arithmetic number, because the mean of its divisors is an integer number (99010275).

Almost surely, 2^678571636 is an apocalyptic number.

It is an amenable number.

678571636 is a deficient number, since it is larger than the sum of its proper divisors (509551664).

678571636 is a wasteful number, since it uses less digits than its factorization.

678571636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88994 (or 88992 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 49.

The square root of 678571636 is about 26049.4075940318. The cubic root of 678571636 is about 878.7497897583.

The spelling of 678571636 in words is "six hundred seventy-eight million, five hundred seventy-one thousand, six hundred thirty-six".