61769820 has 96 divisors (see below), whose sum is σ = 200987136. Its totient is φ = 13881600.

The previous prime is 61769819. The next prime is 61769833. The reversal of 61769820 is 2896716.

61769820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 24415 + ... + 26825.

It is an arithmetic number, because the mean of its divisors is an integer number (2093616).

Almost surely, 2^61769820 is an apocalyptic number.

61769820 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 61769820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100493568).

61769820 is an abundant number, since it is smaller than the sum of its proper divisors (139217316).

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

61769820 is a wasteful number, since it uses less digits than its factorization.

61769820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2491 (or 2489 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 39.

The square root of 61769820 is about 7859.3778379717. The cubic root of 61769820 is about 395.2987538482.

The spelling of 61769820 in words is "sixty-one million, seven hundred sixty-nine thousand, eight hundred twenty".