61144436 has 6 divisors (see below), whose sum is σ = 107002770. Its totient is φ = 30572216.

The previous prime is 61144429. The next prime is 61144439. The reversal of 61144436 is 63444116.

It can be written as a sum of positive squares in only one way, i.e., 41731600 + 19412836 = 6460^2 + 4406^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61144399 and 61144408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61144439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7643051 + ... + 7643058.

It is an arithmetic number, because the mean of its divisors is an integer number (17833795).

Almost surely, 2^61144436 is an apocalyptic number.

It is an amenable number.

61144436 is a deficient number, since it is larger than the sum of its proper divisors (45858334).

61144436 is a wasteful number, since it uses less digits than its factorization.

61144436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15286113 (or 15286111 counting only the distinct ones).

The product of its digits is 6912, while the sum is 29.

The square root of 61144436 is about 7819.4907762590. The cubic root of 61144436 is about 393.9601684419.

The spelling of 61144436 in words is "sixty-one million, one hundred forty-four thousand, four hundred thirty-six".