61728620 has 24 divisors (see below), whose sum is σ = 131090400. Its totient is φ = 24413312.

The previous prime is 61728613. The next prime is 61728629. The reversal of 61728620 is 2682716.

It is not an unprimeable number, because it can be changed into a prime (61728629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15560 + ... + 19119.

It is an arithmetic number, because the mean of its divisors is an integer number (5462100).

Almost surely, 2^61728620 is an apocalyptic number.

It is an amenable number.

61728620 is an abundant number, since it is smaller than the sum of its proper divisors (69361780).

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

61728620 is a wasteful number, since it uses less digits than its factorization.

61728620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34777 (or 34775 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 32.

The square root of 61728620 is about 7856.7563281548. The cubic root of 61728620 is about 395.2108472138.

The spelling of 61728620 in words is "sixty-one million, seven hundred twenty-eight thousand, six hundred twenty".