61309984 has 12 divisors (see below), whose sum is σ = 120704094. Its totient is φ = 30654976.

The previous prime is 61309967. The next prime is 61309987. The reversal of 61309984 is 48990316.

It can be written as a sum of positive squares in only one way, i.e., 61277584 + 32400 = 7828^2 + 180^2 .

It is not an unprimeable number, because it can be changed into a prime (61309987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 957937 + ... + 958000.

Almost surely, 2^61309984 is an apocalyptic number.

It is an amenable number.

61309984 is a deficient number, since it is larger than the sum of its proper divisors (59394110).

61309984 is a wasteful number, since it uses less digits than its factorization.

61309984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1915947 (or 1915939 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 61309984 is about 7830.0692206391. The cubic root of 61309984 is about 394.3153958912.

The spelling of 61309984 in words is "sixty-one million, three hundred nine thousand, nine hundred eighty-four".