61103720 has 32 divisors (see below), whose sum is σ = 138827520. Its totient is φ = 24202560.

The previous prime is 61103711. The next prime is 61103767. The reversal of 61103720 is 2730116.

It is a happy number.

61103720 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 61103692 and 61103701.

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 7 ways as a sum of consecutive naturals, for example, 3296 + ... + 11535.

It is an arithmetic number, because the mean of its divisors is an integer number (4338360).

Almost surely, 2^61103720 is an apocalyptic number.

It is an amenable number.

61103720 is an abundant number, since it is smaller than the sum of its proper divisors (77723800).

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

61103720 is a wasteful number, since it uses less digits than its factorization.

61103720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14945 (or 14941 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 61103720 is about 7816.8868483559. The cubic root of 61103720 is about 393.8727031710.

Adding to 61103720 its reverse (2730116), we get a palindrome (63833836).

The spelling of 61103720 in words is "sixty-one million, one hundred three thousand, seven hundred twenty".