61686394 has 24 divisors (see below), whose sum is σ = 117423648. Its totient is φ = 24033240.

The previous prime is 61686341. The next prime is 61686403. The reversal of 61686394 is 49368616.

It is a super-2 number, since 2×61686394² = 7610422409446472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61686394.

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, 27534 + ... + 29689.

It is an arithmetic number, because the mean of its divisors is an integer number (4892652).

Almost surely, 2^61686394 is an apocalyptic number.

61686394 is a deficient number, since it is larger than the sum of its proper divisors (55737254).

61686394 is a wasteful number, since it uses less digits than its factorization.

61686394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57250 (or 57243 counting only the distinct ones).

The product of its digits is 186624, while the sum is 43.

The square root of 61686394 is about 7854.0686271512. The cubic root of 61686394 is about 395.1207108508.

The spelling of 61686394 in words is "sixty-one million, six hundred eighty-six thousand, three hundred ninety-four".