61648681 has 8 divisors (see below), whose sum is σ = 65356200. Its totient is φ = 57950208.

The previous prime is 61648679. The next prime is 61648703. The reversal of 61648681 is 18684616.

It can be written as a sum of positive squares in 4 ways, for example, as 11451456 + 50197225 = 3384^2 + 7085^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 61648681 - 2¹ = 61648679 is a prime.

It is a super-2 number, since 2×61648681² = 7601119738079522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61648621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16105 + ... + 19561.

It is an arithmetic number, because the mean of its divisors is an integer number (8169525).

Almost surely, 2^61648681 is an apocalyptic number.

It is an amenable number.

61648681 is a deficient number, since it is larger than the sum of its proper divisors (3707519).

61648681 is a wasteful number, since it uses less digits than its factorization.

61648681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4523.

The product of its digits is 55296, while the sum is 40.

The square root of 61648681 is about 7851.6674025330. The cubic root of 61648681 is about 395.0401732361.

The spelling of 61648681 in words is "sixty-one million, six hundred forty-eight thousand, six hundred eighty-one".