61645642 has 4 divisors (see below), whose sum is σ = 92468466. Its totient is φ = 30822820.

The previous prime is 61645627. The next prime is 61645643. The reversal of 61645642 is 24654616.

61645642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 59120721 + 2524921 = 7689^2 + 1589^2 .

It is a junction number, because it is equal to n+sod(n) for n = 61645598 and 61645607.

It is not an unprimeable number, because it can be changed into a prime (61645643) 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, 15411409 + ... + 15411412.

Almost surely, 2^61645642 is an apocalyptic number.

61645642 is a deficient number, since it is larger than the sum of its proper divisors (30822824).

61645642 is a wasteful number, since it uses less digits than its factorization.

61645642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30822823.

The product of its digits is 34560, while the sum is 34.

The square root of 61645642 is about 7851.4738743754. The cubic root of 61645642 is about 395.0336819006.

The spelling of 61645642 in words is "sixty-one million, six hundred forty-five thousand, six hundred forty-two".