61800136 has 8 divisors (see below), whose sum is σ = 115875270. Its totient is φ = 30900064.

The previous prime is 61800127. The next prime is 61800139. The reversal of 61800136 is 63100816.

It can be written as a sum of positive squares in only one way, i.e., 54671236 + 7128900 = 7394^2 + 2670^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 61800136.

It is not an unprimeable number, because it can be changed into a prime (61800139) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3862501 + ... + 3862516.

Almost surely, 2^61800136 is an apocalyptic number.

It is an amenable number.

61800136 is a deficient number, since it is larger than the sum of its proper divisors (54075134).

61800136 is a wasteful number, since it uses less digits than its factorization.

61800136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7725023 (or 7725019 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 61800136 is about 7861.3062527801. The cubic root of 61800136 is about 395.3634128086.

The spelling of 61800136 in words is "sixty-one million, eight hundred thousand, one hundred thirty-six".