61810506 has 32 divisors (see below), whose sum is σ = 138702720. Its totient is φ = 20401632.

The previous prime is 61810501. The next prime is 61810531. The reversal of 61810506 is 60501816.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 61810506.

It is not an unprimeable number, because it can be changed into a prime (61810501) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6 + ... + 11118.

It is an arithmetic number, because the mean of its divisors is an integer number (4334460).

Almost surely, 2^61810506 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61810506, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69351360).

61810506 is an abundant number, since it is smaller than the sum of its proper divisors (76892214).

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

61810506 is a wasteful number, since it uses less digits than its factorization.

61810506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11227 (or 11221 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

The square root of 61810506 is about 7861.9657847131. The cubic root of 61810506 is about 395.3855254314.

The spelling of 61810506 in words is "sixty-one million, eight hundred ten thousand, five hundred six".