61619645 has 32 divisors (see below), whose sum is σ = 83711232. Its totient is φ = 43287552.

The previous prime is 61619629. The next prime is 61619651. The reversal of 61619645 is 54691616.

It is a cyclic number.

It is not a de Polignac number, because 61619645 - 2⁴ = 61619629 is a prime.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 61619599 and 61619608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 83699 + ... + 84431.

It is an arithmetic number, because the mean of its divisors is an integer number (2615976).

Almost surely, 2^61619645 is an apocalyptic number.

It is an amenable number.

61619645 is a deficient number, since it is larger than the sum of its proper divisors (22091587).

61619645 is a wasteful number, since it uses less digits than its factorization.

61619645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821.

The product of its digits is 38880, while the sum is 38.

The square root of 61619645 is about 7849.8181507599. The cubic root of 61619645 is about 394.9781433187.

The spelling of 61619645 in words is "sixty-one million, six hundred nineteen thousand, six hundred forty-five".