61223420 has 24 divisors (see below), whose sum is σ = 130200000. Its totient is φ = 24178752.

The previous prime is 61223417. The next prime is 61223423. The reversal of 61223420 is 2432216.

It is an interprime number because it is at equal distance from previous prime (61223417) and next prime (61223423).

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 = 61223392 and 61223401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61223423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17795 + ... + 20954.

It is an arithmetic number, because the mean of its divisors is an integer number (5425000).

Almost surely, 2^61223420 is an apocalyptic number.

It is an amenable number.

61223420 is an abundant number, since it is smaller than the sum of its proper divisors (68976580).

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

61223420 is a wasteful number, since it uses less digits than its factorization.

61223420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38837 (or 38835 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 61223420 is about 7824.5396030693. The cubic root of 61223420 is about 394.1297295838.

Adding to 61223420 its reverse (2432216), we get a palindrome (63655636).

The spelling of 61223420 in words is "sixty-one million, two hundred twenty-three thousand, four hundred twenty".