61638746 has 16 divisors (see below), whose sum is σ = 103005000. Its totient is φ = 27467328.

The previous prime is 61638713. The next prime is 61638749. The reversal of 61638746 is 64783616.

It can be written as a sum of positive squares in 4 ways, for example, as 24611521 + 37027225 = 4961^2 + 6085^2 .

It is not an unprimeable number, because it can be changed into a prime (61638749) 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, 40121 + ... + 41628.

Almost surely, 2^61638746 is an apocalyptic number.

61638746 is a deficient number, since it is larger than the sum of its proper divisors (41366254).

61638746 is a wasteful number, since it uses less digits than its factorization.

61638746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81793.

The product of its digits is 145152, while the sum is 41.

The square root of 61638746 is about 7851.0347088776. The cubic root of 61638746 is about 395.0189511818.

The spelling of 61638746 in words is "sixty-one million, six hundred thirty-eight thousand, seven hundred forty-six".