6128720744 has 8 divisors (see below), whose sum is σ = 11491351410. Its totient is φ = 3064360368.

The previous prime is 6128720743. The next prime is 6128720777. The reversal of 6128720744 is 4470278216.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 5766579844 + 362140900 = 75938^2 + 19030^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×6128720744² = 75122435915871827072, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6128720743) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 383045039 + ... + 383045054.

Almost surely, 2^6128720744 is an apocalyptic number.

It is an amenable number.

6128720744 is a deficient number, since it is larger than the sum of its proper divisors (5362630666).

6128720744 is a wasteful number, since it uses less digits than its factorization.

6128720744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 766090099 (or 766090095 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 41.

The square root of 6128720744 is about 78286.1465650213. The cubic root of 6128720744 is about 1830.0232654532.

The spelling of 6128720744 in words is "six billion, one hundred twenty-eight million, seven hundred twenty thousand, seven hundred forty-four".