61321380 has 96 divisors (see below), whose sum is σ = 184343040. Its totient is φ = 15175680.

The previous prime is 61321369. The next prime is 61321439. The reversal of 61321380 is 8312316.

61321380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 61321380.

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, 80200 + ... + 80960.

It is an arithmetic number, because the mean of its divisors is an integer number (1920240).

Almost surely, 2^61321380 is an apocalyptic number.

61321380 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 61321380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92171520).

61321380 is an abundant number, since it is smaller than the sum of its proper divisors (123021660).

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

61321380 is a wasteful number, since it uses less digits than its factorization.

61321380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 869 (or 867 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 61321380 is about 7830.7968943141. The cubic root of 61321380 is about 394.3398255168.

Adding to 61321380 its reverse (8312316), we get a palindrome (69633696).

The spelling of 61321380 in words is "sixty-one million, three hundred twenty-one thousand, three hundred eighty".