128732612746 has 4 divisors (see below), whose sum is σ = 193098919122. Its totient is φ = 64366306372.

The previous prime is 128732612731. The next prime is 128732612773. The reversal of 128732612746 is 647216237821.

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., 70429198225 + 58303414521 = 265385^2 + 241461^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 128732612746.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32183153185 + ... + 32183153188.

Almost surely, 2^128732612746 is an apocalyptic number.

128732612746 is a deficient number, since it is larger than the sum of its proper divisors (64366306376).

128732612746 is an equidigital number, since it uses as much as digits as its factorization.

128732612746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64366306375.

The product of its digits is 1354752, while the sum is 49.

The spelling of 128732612746 in words is "one hundred twenty-eight billion, seven hundred thirty-two million, six hundred twelve thousand, seven hundred forty-six".