61728388953 has 32 divisors (see below), whose sum is σ = 102810580992. Its totient is φ = 32005084800.

The previous prime is 61728388927. The next prime is 61728388961. The reversal of 61728388953 is 35988382716.

It is not a de Polignac number, because 61728388953 - 2²⁹ = 61191518041 is a prime.

It is not an unprimeable number, because it can be changed into a prime (61728388913) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136101 + ... + 376802.

It is an arithmetic number, because the mean of its divisors is an integer number (3212830656).

Almost surely, 2^61728388953 is an apocalyptic number.

It is an amenable number.

61728388953 is a deficient number, since it is larger than the sum of its proper divisors (41082192039).

61728388953 is a wasteful number, since it uses less digits than its factorization.

61728388953 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 513445.

The product of its digits is 17418240, while the sum is 60.

The spelling of 61728388953 in words is "sixty-one billion, seven hundred twenty-eight million, three hundred eighty-eight thousand, nine hundred fifty-three".