61725520 has 20 divisors (see below), whose sum is σ = 143512020. Its totient is φ = 24690176.

The previous prime is 61725493. The next prime is 61725533. The reversal of 61725520 is 2552716.

It can be written as a sum of positive squares in 2 ways, for example, as 26584336 + 35141184 = 5156^2 + 5928^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 385705 + ... + 385864.

It is an arithmetic number, because the mean of its divisors is an integer number (7175601).

Almost surely, 2^61725520 is an apocalyptic number.

It is an amenable number.

61725520 is an abundant number, since it is smaller than the sum of its proper divisors (81786500).

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

61725520 is a wasteful number, since it uses less digits than its factorization.

61725520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771582 (or 771576 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 28.

The square root of 61725520 is about 7856.5590432453. The cubic root of 61725520 is about 395.2042312976.

The spelling of 61725520 in words is "sixty-one million, seven hundred twenty-five thousand, five hundred twenty".