61986728 has 8 divisors (see below), whose sum is σ = 116225130. Its totient is φ = 30993360.

The previous prime is 61986707. The next prime is 61986751. The reversal of 61986728 is 82768916.

It can be written as a sum of positive squares in only one way, i.e., 50951044 + 11035684 = 7138^2 + 3322^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3874163 + ... + 3874178.

Almost surely, 2^61986728 is an apocalyptic number.

It is an amenable number.

61986728 is a deficient number, since it is larger than the sum of its proper divisors (54238402).

61986728 is a wasteful number, since it uses less digits than its factorization.

61986728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7748347 (or 7748343 counting only the distinct ones).

The product of its digits is 290304, while the sum is 47.

The square root of 61986728 is about 7873.1650560623. The cubic root of 61986728 is about 395.7609174809.

The spelling of 61986728 in words is "sixty-one million, nine hundred eighty-six thousand, seven hundred twenty-eight".