61863684 has 12 divisors (see below), whose sum is σ = 144348624. Its totient is φ = 20621224.

The previous prime is 61863679. The next prime is 61863691. The reversal of 61863684 is 48636816.

It is a happy number.

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

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, 2577642 + ... + 2577665.

It is an arithmetic number, because the mean of its divisors is an integer number (12029052).

Almost surely, 2^61863684 is an apocalyptic number.

It is an amenable number.

61863684 is an abundant number, since it is smaller than the sum of its proper divisors (82484940).

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

61863684 is a wasteful number, since it uses less digits than its factorization.

61863684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5155314 (or 5155312 counting only the distinct ones).

The product of its digits is 165888, while the sum is 42.

The square root of 61863684 is about 7865.3470362089. The cubic root of 61863684 is about 395.4988814822.

It can be divided in two parts, 6186 and 3684, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 61863684 in words is "sixty-one million, eight hundred sixty-three thousand, six hundred eighty-four".