61686204 has 12 divisors (see below), whose sum is σ = 143934504. Its totient is φ = 20562064.

The previous prime is 61686193. The next prime is 61686227. The reversal of 61686204 is 40268616.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

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, 2570247 + ... + 2570270.

It is an arithmetic number, because the mean of its divisors is an integer number (11994542).

Almost surely, 2^61686204 is an apocalyptic number.

It is an amenable number.

61686204 is an abundant number, since it is smaller than the sum of its proper divisors (82248300).

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

61686204 is a wasteful number, since it uses less digits than its factorization.

61686204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5140524 (or 5140522 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 61686204 is about 7854.0565315001. The cubic root of 61686204 is about 395.1203051805.

The spelling of 61686204 in words is "sixty-one million, six hundred eighty-six thousand, two hundred four".