61840642734 has 96 divisors (see below), whose sum is σ = 146886929280. Its totient is φ = 18688610304.

The previous prime is 61840642727. The next prime is 61840642763. The reversal of 61840642734 is 43724604816.

61840642734 is a `hidden beast` number, since 618 + 4 + 0 + 6 + 4 + 27 + 3 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 61840642734.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3559132 + ... + 3576464.

It is an arithmetic number, because the mean of its divisors is an integer number (1530072180).

Almost surely, 2^61840642734 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 61840642734, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (73443464640).

61840642734 is an abundant number, since it is smaller than the sum of its proper divisors (85046286546).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

61840642734 is a wasteful number, since it uses less digits than its factorization.

61840642734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17626 (or 17623 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 45.

The spelling of 61840642734 in words is "sixty-one billion, eight hundred forty million, six hundred forty-two thousand, seven hundred thirty-four".