61781032 has 8 divisors (see below), whose sum is σ = 115839450. Its totient is φ = 30890512.

The previous prime is 61781029. The next prime is 61781033. The reversal of 61781032 is 23018716.

61781032 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 35832196 + 25948836 = 5986^2 + 5094^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (61781033) 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 as a sum of consecutive naturals, namely, 3861307 + ... + 3861322.

Almost surely, 2^61781032 is an apocalyptic number.

It is an amenable number.

61781032 is a deficient number, since it is larger than the sum of its proper divisors (54058418).

61781032 is a wasteful number, since it uses less digits than its factorization.

61781032 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7722635 (or 7722631 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 61781032 is about 7860.0910936197. The cubic root of 61781032 is about 395.3226696348.

Adding to 61781032 its reverse (23018716), we get a palindrome (84799748).

The spelling of 61781032 in words is "sixty-one million, seven hundred eighty-one thousand, thirty-two".