88643728645 has 4 divisors (see below), whose sum is σ = 106372474380. Its totient is φ = 70914982912.

The previous prime is 88643728637. The next prime is 88643728651. The reversal of 88643728645 is 54682734688.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 42152606721 + 46491121924 = 205311^2 + 215618^2 .

It is a cyclic number.

It is not a de Polignac number, because 88643728645 - 2³ = 88643728637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8864372860 + ... + 8864372869.

It is an arithmetic number, because the mean of its divisors is an integer number (26593118595).

Almost surely, 2^88643728645 is an apocalyptic number.

It is an amenable number.

88643728645 is a deficient number, since it is larger than the sum of its proper divisors (17728745735).

88643728645 is a wasteful number, since it uses less digits than its factorization.

88643728645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17728745734.

The product of its digits is 61931520, while the sum is 61.

The spelling of 88643728645 in words is "eighty-eight billion, six hundred forty-three million, seven hundred twenty-eight thousand, six hundred forty-five".