61543668 has 12 divisors (see below), whose sum is σ = 143601920. Its totient is φ = 20514552.

The previous prime is 61543663. The next prime is 61543709. The reversal of 61543668 is 86634516.

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

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61543663) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2564308 + ... + 2564331.

Almost surely, 2^61543668 is an apocalyptic number.

It is an amenable number.

61543668 is an abundant number, since it is smaller than the sum of its proper divisors (82058252).

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

61543668 is a wasteful number, since it uses less digits than its factorization.

61543668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5128646 (or 5128644 counting only the distinct ones).

The product of its digits is 103680, while the sum is 39.

The square root of 61543668 is about 7844.9772466209. The cubic root of 61543668 is about 394.8157405836.

The spelling of 61543668 in words is "sixty-one million, five hundred forty-three thousand, six hundred sixty-eight".