61771128 has 32 divisors (see below), whose sum is σ = 162556800. Its totient is φ = 19506528.

The previous prime is 61771121. The next prime is 61771141. The reversal of 61771128 is 82117716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61771121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67276 + ... + 68187.

It is an arithmetic number, because the mean of its divisors is an integer number (5079900).

Almost surely, 2^61771128 is an apocalyptic number.

It is an amenable number.

61771128 is an abundant number, since it is smaller than the sum of its proper divisors (100785672).

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

61771128 is a wasteful number, since it uses less digits than its factorization.

61771128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135491 (or 135487 counting only the distinct ones).

The product of its digits is 4704, while the sum is 33.

The square root of 61771128 is about 7859.4610502248. The cubic root of 61771128 is about 395.3015440302.

The spelling of 61771128 in words is "sixty-one million, seven hundred seventy-one thousand, one hundred twenty-eight".