61691128 has 8 divisors (see below), whose sum is σ = 115670880. Its totient is φ = 30845560.

The previous prime is 61691117. The next prime is 61691131. The reversal of 61691128 is 82119616.

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

It is a junction number, because it is equal to n+sod(n) for n = 61691093 and 61691102.

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, 3855688 + ... + 3855703.

It is an arithmetic number, because the mean of its divisors is an integer number (14458860).

Almost surely, 2^61691128 is an apocalyptic number.

It is an amenable number.

61691128 is a deficient number, since it is larger than the sum of its proper divisors (53979752).

61691128 is a wasteful number, since it uses less digits than its factorization.

61691128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7711397 (or 7711393 counting only the distinct ones).

The product of its digits is 5184, while the sum is 34.

The square root of 61691128 is about 7854.3699938315. The cubic root of 61691128 is about 395.1308181774.

The spelling of 61691128 in words is "sixty-one million, six hundred ninety-one thousand, one hundred twenty-eight".