61831860 has 48 divisors (see below), whose sum is σ = 175089600. Its totient is φ = 16301824.

The previous prime is 61831829. The next prime is 61831919. The reversal of 61831860 is 6813816.

It is a super-2 number, since 2×61831860² = 7646357822119200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 450 + ... + 11129.

It is an arithmetic number, because the mean of its divisors is an integer number (3647700).

Almost surely, 2^61831860 is an apocalyptic number.

61831860 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61831860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87544800).

61831860 is an abundant number, since it is smaller than the sum of its proper divisors (113257740).

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

61831860 is a wasteful number, since it uses less digits than its factorization.

61831860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11680 (or 11678 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 33.

The square root of 61831860 is about 7863.3237247363. The cubic root of 61831860 is about 395.4310521601.

The spelling of 61831860 in words is "sixty-one million, eight hundred thirty-one thousand, eight hundred sixty".