61448220 has 120 divisors (see below), whose sum is σ = 195514704. Its totient is φ = 16153344.

The previous prime is 61448213. The next prime is 61448227. The reversal of 61448220 is 2284416.

61448220 is a `hidden beast` number, since 614 + 48 + 2 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (61448213) and next prime (61448227).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61448227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 134232 + ... + 134688.

Almost surely, 2^61448220 is an apocalyptic number.

61448220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61448220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (97757352).

61448220 is an abundant number, since it is smaller than the sum of its proper divisors (134066484).

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

61448220 is a wasteful number, since it uses less digits than its factorization.

61448220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561 (or 550 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 61448220 is about 7838.8915032675. The cubic root of 61448220 is about 394.6115285589.

The spelling of 61448220 in words is "sixty-one million, four hundred forty-eight thousand, two hundred twenty".