61665672 has 32 divisors (see below), whose sum is σ = 154507680. Its totient is φ = 20509440.

The previous prime is 61665619. The next prime is 61665673. The reversal of 61665672 is 27656616.

61665672 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-3 number, since 3×61665672³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 61665672.

It is not an unprimeable number, because it can be changed into a prime (61665673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9168 + ... + 14400.

It is an arithmetic number, because the mean of its divisors is an integer number (4828365).

Almost surely, 2^61665672 is an apocalyptic number.

It is an amenable number.

61665672 is an abundant number, since it is smaller than the sum of its proper divisors (92842008).

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

61665672 is a wasteful number, since it uses less digits than its factorization.

61665672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5733 (or 5729 counting only the distinct ones).

The product of its digits is 90720, while the sum is 39.

The square root of 61665672 is about 7852.7493274649. The cubic root of 61665672 is about 395.0764622581.

The spelling of 61665672 in words is "sixty-one million, six hundred sixty-five thousand, six hundred seventy-two".