61554220 has 96 divisors (see below), whose sum is σ = 164376576. Its totient is φ = 18835200.

The previous prime is 61554203. The next prime is 61554223. The reversal of 61554220 is 2245516.

It is not an unprimeable number, because it can be changed into a prime (61554223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55875 + ... + 56965.

It is an arithmetic number, because the mean of its divisors is an integer number (1712256).

Almost surely, 2^61554220 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 61554220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82188288).

61554220 is an abundant number, since it is smaller than the sum of its proper divisors (102822356).

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

61554220 is a wasteful number, since it uses less digits than its factorization.

61554220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1151 (or 1149 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

The square root of 61554220 is about 7845.6497500207. The cubic root of 61554220 is about 394.8383037368.

Adding to 61554220 its reverse (2245516), we get a palindrome (63799736).

The spelling of 61554220 in words is "sixty-one million, five hundred fifty-four thousand, two hundred twenty".