61728406834 has 4 divisors (see below), whose sum is σ = 92592610254. Its totient is φ = 30864203416.

The previous prime is 61728406787. The next prime is 61728406841. The reversal of 61728406834 is 43860482716.

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., 59315141209 + 2413265625 = 243547^2 + 49125^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 15432101707 + ... + 15432101710.

Almost surely, 2^61728406834 is an apocalyptic number.

61728406834 is a deficient number, since it is larger than the sum of its proper divisors (30864203420).

61728406834 is a wasteful number, since it uses less digits than its factorization.

61728406834 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30864203419.

The product of its (nonzero) digits is 1548288, while the sum is 49.

The spelling of 61728406834 in words is "sixty-one billion, seven hundred twenty-eight million, four hundred six thousand, eight hundred thirty-four".