61885830 has 64 divisors (see below), whose sum is σ = 154091520. Its totient is φ = 15894144.

The previous prime is 61885829. The next prime is 61885853. The reversal of 61885830 is 3858816.

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 31 ways as a sum of consecutive naturals, for example, 140751 + ... + 141189.

It is an arithmetic number, because the mean of its divisors is an integer number (2407680).

Almost surely, 2^61885830 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61885830, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77045760).

61885830 is an abundant number, since it is smaller than the sum of its proper divisors (92205690).

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

61885830 is a wasteful number, since it uses less digits than its factorization.

61885830 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 613.

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 61885830 is about 7866.7547311455. The cubic root of 61885830 is about 395.5460694969.

The spelling of 61885830 in words is "sixty-one million, eight hundred eighty-five thousand, eight hundred thirty".