3648721477128 has 96 divisors (see below), whose sum is σ = 11288521310400. Its totient is φ = 962300162304.

The previous prime is 3648721477073. The next prime is 3648721477133. The reversal of 3648721477128 is 8217741278463.

It is a happy number.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 64227763 + ... + 64284546.

It is an arithmetic number, because the mean of its divisors is an integer number (117588763650).

Almost surely, 2^{3648721477128} is an apocalyptic number.

It is an amenable number.

3648721477128 is an abundant number, since it is smaller than the sum of its proper divisors (7639799833272).

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

3648721477128 is a wasteful number, since it uses less digits than its factorization.

3648721477128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128512351 (or 128512334 counting only the distinct ones).

The product of its digits is 25288704, while the sum is 60.

The spelling of 3648721477128 in words is "three trillion, six hundred forty-eight billion, seven hundred twenty-one million, four hundred seventy-seven thousand, one hundred twenty-eight".