61782870 has 64 divisors (see below), whose sum is σ = 157697280. Its totient is φ = 15447168.

The previous prime is 61782839. The next prime is 61782881. The reversal of 61782870 is 7828716.

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 31 ways as a sum of consecutive naturals, for example, 60484 + ... + 61496.

It is an arithmetic number, because the mean of its divisors is an integer number (2464020).

Almost surely, 2^61782870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61782870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78848640).

61782870 is an abundant number, since it is smaller than the sum of its proper divisors (95914410).

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

61782870 is a wasteful number, since it uses less digits than its factorization.

61782870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 37632, while the sum is 39.

The square root of 61782870 is about 7860.2080125147. The cubic root of 61782870 is about 395.3265899096.

The spelling of 61782870 in words is "sixty-one million, seven hundred eighty-two thousand, eight hundred seventy".