61731128 has 8 divisors (see below), whose sum is σ = 115745880. Its totient is φ = 30865560.

The previous prime is 61731113. The next prime is 61731139. The reversal of 61731128 is 82113716.

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 61731128.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3858188 + ... + 3858203.

It is an arithmetic number, because the mean of its divisors is an integer number (14468235).

Almost surely, 2^61731128 is an apocalyptic number.

It is an amenable number.

61731128 is a deficient number, since it is larger than the sum of its proper divisors (54014752).

61731128 is a wasteful number, since it uses less digits than its factorization.

61731128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7716397 (or 7716393 counting only the distinct ones).

The product of its digits is 2016, while the sum is 29.

The square root of 61731128 is about 7856.9159343855. The cubic root of 61731128 is about 395.2161995414.

The spelling of 61731128 in words is "sixty-one million, seven hundred thirty-one thousand, one hundred twenty-eight".