61103440 has 80 divisors (see below), whose sum is σ = 151865280. Its totient is φ = 22784000.

The previous prime is 61103429. The next prime is 61103447. The reversal of 61103440 is 4430116.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61103447) 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, 243315 + ... + 243565.

It is an arithmetic number, because the mean of its divisors is an integer number (1898316).

Almost surely, 2^61103440 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 61103440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75932640).

61103440 is an abundant number, since it is smaller than the sum of its proper divisors (90761840).

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

61103440 is a wasteful number, since it uses less digits than its factorization.

61103440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 454 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 61103440 is about 7816.8689383921. The cubic root of 61103440 is about 393.8721015463.

Adding to 61103440 its reverse (4430116), we get a palindrome (65533556).

The spelling of 61103440 in words is "sixty-one million, one hundred three thousand, four hundred forty".