61729660 has 24 divisors (see below), whose sum is σ = 129802176. Its totient is φ = 24659520.

The previous prime is 61729627. The next prime is 61729663. The reversal of 61729660 is 6692716.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61729663) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18909 + ... + 21931.

It is an arithmetic number, because the mean of its divisors is an integer number (5408424).

Almost surely, 2^61729660 is an apocalyptic number.

It is an amenable number.

61729660 is an abundant number, since it is smaller than the sum of its proper divisors (68072516).

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

61729660 is a wasteful number, since it uses less digits than its factorization.

61729660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4053 (or 4051 counting only the distinct ones).

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 61729660 is about 7856.8225129501. The cubic root of 61729660 is about 395.2130666974.

The spelling of 61729660 in words is "sixty-one million, seven hundred twenty-nine thousand, six hundred sixty".