61688725 has 24 divisors (see below), whose sum is σ = 92027840. Its totient is φ = 40072320.

The previous prime is 61688717. The next prime is 61688743. The reversal of 61688725 is 52788616.

It is not a de Polignac number, because 61688725 - 2³ = 61688717 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5952 + ... + 12601.

Almost surely, 2^61688725 is an apocalyptic number.

It is an amenable number.

61688725 is a deficient number, since it is larger than the sum of its proper divisors (30339115).

61688725 is a wasteful number, since it uses less digits than its factorization.

61688725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18589 (or 18584 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 61688725 is about 7854.2170201746. The cubic root of 61688725 is about 395.1256877169.

The spelling of 61688725 in words is "sixty-one million, six hundred eighty-eight thousand, seven hundred twenty-five".