61440340 has 48 divisors (see below), whose sum is σ = 141063552. Its totient is φ = 22340736.

The previous prime is 61440331. The next prime is 61440361. The reversal of 61440340 is 4304416.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15657 + ... + 19183.

It is an arithmetic number, because the mean of its divisors is an integer number (2938824).

Almost surely, 2^61440340 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61440340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70531776).

61440340 is an abundant number, since it is smaller than the sum of its proper divisors (79623212).

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

61440340 is a wasteful number, since it uses less digits than its factorization.

61440340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3616 (or 3614 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 61440340 is about 7838.3888650666. The cubic root of 61440340 is about 394.5946597666.

Adding to 61440340 its reverse (4304416), we get a palindrome (65744756).

The spelling of 61440340 in words is "sixty-one million, four hundred forty thousand, three hundred forty".