61128920 has 16 divisors (see below), whose sum is σ = 137540160. Its totient is φ = 24451552.

The previous prime is 61128913. The next prime is 61128961. The reversal of 61128920 is 2982116.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 764072 + ... + 764151.

It is an arithmetic number, because the mean of its divisors is an integer number (8596260).

Almost surely, 2^61128920 is an apocalyptic number.

It is an amenable number.

61128920 is an abundant number, since it is smaller than the sum of its proper divisors (76411240).

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

61128920 is a wasteful number, since it uses less digits than its factorization.

61128920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1528234 (or 1528230 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 61128920 is about 7818.4985770927. The cubic root of 61128920 is about 393.9268418713.

The spelling of 61128920 in words is "sixty-one million, one hundred twenty-eight thousand, nine hundred twenty".