61214720 has 156 divisors (see below), whose sum is σ = 173681964. Its totient is φ = 20643840.

The previous prime is 61214719. The next prime is 61214729. The reversal of 61214720 is 2741216.

It can be written as a sum of positive squares in 2 ways, for example, as 9834496 + 51380224 = 3136^2 + 7168^2 .

It is not an unprimeable number, because it can be changed into a prime (61214729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1003490 + ... + 1003550.

Almost surely, 2^61214720 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 61214720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86840982).

61214720 is an abundant number, since it is smaller than the sum of its proper divisors (112467244).

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

61214720 is an equidigital number, since it uses as much as digits as its factorization.

61214720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 672, while the sum is 23.

The square root of 61214720 is about 7823.9836400647. The cubic root of 61214720 is about 394.1110597617. Note that the first 3 decimals are identical.

Adding to 61214720 its reverse (2741216), we get a palindrome (63955936).

The spelling of 61214720 in words is "sixty-one million, two hundred fourteen thousand, seven hundred twenty".