61351644 has 24 divisors (see below), whose sum is σ = 144118800. Its totient is φ = 20312704.

The previous prime is 61351643. The next prime is 61351651. The reversal of 61351644 is 44615316.

61351644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61351643) 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 7 ways as a sum of consecutive naturals, for example, 15369 + ... + 18944.

It is an arithmetic number, because the mean of its divisors is an integer number (6004950).

Almost surely, 2^61351644 is an apocalyptic number.

It is an amenable number.

61351644 is an abundant number, since it is smaller than the sum of its proper divisors (82767156).

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

61351644 is a wasteful number, since it uses less digits than its factorization.

61351644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34469 (or 34467 counting only the distinct ones).

The product of its digits is 8640, while the sum is 30.

The square root of 61351644 is about 7832.7290263356. The cubic root of 61351644 is about 394.4046878193.

The spelling of 61351644 in words is "sixty-one million, three hundred fifty-one thousand, six hundred forty-four".