61810 has 16 divisors (see below), whose sum is σ = 127296. Its totient is φ = 21168.

The previous prime is 61781. The next prime is 61813. The reversal of 61810 is 1816.

It is a super-2 number, since 2×61810² = 7640952200, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (61813) by changing a digit.

61810 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 372 + ... + 511.

It is an arithmetic number, because the mean of its divisors is an integer number (7956).

2⁶¹⁸¹⁰ is an apocalyptic number.

61810 is an abundant number, since it is smaller than the sum of its proper divisors (65486).

It is a weird number, because it is abundant, but not a pseudoperfect number.

It is a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63648).

61810 is a wasteful number, since it uses less digits than its factorization.

61810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 897.

The product of its (nonzero) digits is 48, while the sum is 16.

The square root of 61810 is about 248.6161700292. The cubic root of 61810 is about 39.5384446512.

The spelling of 61810 in words is "sixty-one thousand, eight hundred ten".