61666872 has 32 divisors (see below), whose sum is σ = 154360080. Its totient is φ = 20529920.

The previous prime is 61666861. The next prime is 61666889. The reversal of 61666872 is 27866616.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34972 + ... + 36692.

Almost surely, 2^61666872 is an apocalyptic number.

It is an amenable number.

61666872 is an abundant number, since it is smaller than the sum of its proper divisors (92693208).

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

61666872 is a wasteful number, since it uses less digits than its factorization.

61666872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3223 (or 3219 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 61666872 is about 7852.8257334542. The cubic root of 61666872 is about 395.0790249410.

The spelling of 61666872 in words is "sixty-one million, six hundred sixty-six thousand, eight hundred seventy-two".