6721268787 has 20 divisors (see below), whose sum is σ = 10046781976. Its totient is φ = 4478004000.

The previous prime is 6721268783. The next prime is 6721268819. The reversal of 6721268787 is 7878621276.

It is a happy number.

It is not a de Polignac number, because 6721268787 - 2² = 6721268783 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6721268783) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 106287 + ... + 157287.

Almost surely, 2^6721268787 is an apocalyptic number.

6721268787 is a deficient number, since it is larger than the sum of its proper divisors (3325513189).

6721268787 is a wasteful number, since it uses less digits than its factorization.

6721268787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52640 (or 52631 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 6721268787 is about 81983.3445707114. The cubic root of 6721268787 is about 1887.1963495098.

The spelling of 6721268787 in words is "six billion, seven hundred twenty-one million, two hundred sixty-eight thousand, seven hundred eighty-seven".