61621728395 has 8 divisors (see below), whose sum is σ = 74002919760. Its totient is φ = 49259485600.

The previous prime is 61621728361. The next prime is 61621728407. The reversal of 61621728395 is 59382712616.

It is a happy number.

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

It is not a de Polignac number, because 61621728395 - 2⁶ = 61621728331 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4729985 + ... + 4742994.

It is an arithmetic number, because the mean of its divisors is an integer number (9250364970).

Almost surely, 2^61621728395 is an apocalyptic number.

61621728395 is a deficient number, since it is larger than the sum of its proper divisors (12381191365).

61621728395 is a wasteful number, since it uses less digits than its factorization.

61621728395 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9474285.

The product of its digits is 1088640, while the sum is 50.

The spelling of 61621728395 in words is "sixty-one billion, six hundred twenty-one million, seven hundred twenty-eight thousand, three hundred ninety-five".