61228880 has 40 divisors (see below), whose sum is σ = 143240832. Its totient is φ = 24339584.

The previous prime is 61228879. The next prime is 61228903. The reversal of 61228880 is 8882216.

It is a tau number, because it is divible by the number of its divisors (40).

It is a self number, because there is not a number n which added to its sum of digits gives 61228880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11069 + ... + 15651.

Almost surely, 2^61228880 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 61228880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71620416).

61228880 is an abundant number, since it is smaller than the sum of its proper divisors (82011952).

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

61228880 is a wasteful number, since it uses less digits than its factorization.

61228880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4763 (or 4757 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The square root of 61228880 is about 7824.8884976081. Note that the first 3 decimals coincide. The cubic root of 61228880 is about 394.1414456034.

It can be divided in two parts, 612 and 28880, that added together give a palindrome (29492).

The spelling of 61228880 in words is "sixty-one million, two hundred twenty-eight thousand, eight hundred eighty".