61728715053 has 24 divisors (see below), whose sum is σ = 90570456288. Its totient is φ = 40508106912.

The previous prime is 61728715043. The next prime is 61728715057. The reversal of 61728715053 is 35051782716.

It is a happy number.

61728715053 is a `hidden beast` number, since 6 + 1 + 72 + 8 + 71 + 505 + 3 = 666.

It is not a de Polignac number, because 61728715053 - 2¹⁷ = 61728583981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61728715057) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52951 + ... + 355332.

It is an arithmetic number, because the mean of its divisors is an integer number (3773769012).

Almost surely, 2^61728715053 is an apocalyptic number.

It is an amenable number.

61728715053 is a deficient number, since it is larger than the sum of its proper divisors (28841741235).

61728715053 is a wasteful number, since it uses less digits than its factorization.

61728715053 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408553 (or 408550 counting only the distinct ones).

The product of its (nonzero) digits is 352800, while the sum is 45.

The spelling of 61728715053 in words is "sixty-one billion, seven hundred twenty-eight million, seven hundred fifteen thousand, fifty-three".