61686270 has 48 divisors (see below), whose sum is σ = 163116720. Its totient is φ = 16169472.

The previous prime is 61686259. The next prime is 61686301. The reversal of 61686270 is 7268616.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 499 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (3398265).

Almost surely, 2^61686270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61686270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81558360).

61686270 is an abundant number, since it is smaller than the sum of its proper divisors (101430450).

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

61686270 is a wasteful number, since it uses less digits than its factorization.

61686270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689 (or 11686 counting only the distinct ones).

The product of its (nonzero) digits is 24192, while the sum is 36.

The square root of 61686270 is about 7854.0607331494. The cubic root of 61686270 is about 395.1204460976.

The spelling of 61686270 in words is "sixty-one million, six hundred eighty-six thousand, two hundred seventy".