61220772 has 30 divisors (see below), whose sum is σ = 160044038. Its totient is φ = 20406816.

The previous prime is 61220771. The next prime is 61220773. The reversal of 61220772 is 27702216.

61220772 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (61220771) and next prime (61220773).

It can be written as a sum of positive squares in only one way, i.e., 41293476 + 19927296 = 6426^2 + 4464^2 .

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

It is not an unprimeable number, because it can be changed into a prime (61220771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 94153 + ... + 94800.

Almost surely, 2^61220772 is an apocalyptic number.

It is an amenable number.

61220772 is an abundant number, since it is smaller than the sum of its proper divisors (98823266).

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

61220772 is a wasteful number, since it uses less digits than its factorization.

61220772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188969 (or 188958 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 61220772 is about 7824.3703900058. The cubic root of 61220772 is about 394.1240472781.

Adding to 61220772 its reverse (27702216), we get a palindrome (88922988).

The spelling of 61220772 in words is "sixty-one million, two hundred twenty thousand, seven hundred seventy-two".