61791220 has 12 divisors (see below), whose sum is σ = 129761604. Its totient is φ = 24716480.

The previous prime is 61791203. The next prime is 61791227. The reversal of 61791220 is 2219716.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 45887076 = 3988^2 + 6774^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61791227) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1544761 + ... + 1544800.

It is an arithmetic number, because the mean of its divisors is an integer number (10813467).

Almost surely, 2^61791220 is an apocalyptic number.

It is an amenable number.

61791220 is an abundant number, since it is smaller than the sum of its proper divisors (67970384).

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

61791220 is a wasteful number, since it uses less digits than its factorization.

61791220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3089570 (or 3089568 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 61791220 is about 7860.7391509959. The cubic root of 61791220 is about 395.3443986664.

The spelling of 61791220 in words is "sixty-one million, seven hundred ninety-one thousand, two hundred twenty".