6403872885 has 64 divisors (see below), whose sum is σ = 11020520448. Its totient is φ = 3163956224.

The previous prime is 6403872883. The next prime is 6403872941. The reversal of 6403872885 is 5882783046.

It is a happy number.

It is not a de Polignac number, because 6403872885 - 2¹ = 6403872883 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6403872883) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9375754 + ... + 9376436.

It is an arithmetic number, because the mean of its divisors is an integer number (172195632).

Almost surely, 2^6403872885 is an apocalyptic number.

It is an amenable number.

6403872885 is a deficient number, since it is larger than the sum of its proper divisors (4616647563).

6403872885 is a wasteful number, since it uses less digits than its factorization.

6403872885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234.

The product of its (nonzero) digits is 2580480, while the sum is 51.

The square root of 6403872885 is about 80024.2018704342. The cubic root of 6403872885 is about 1857.0099650062.

The spelling of 6403872885 in words is "six billion, four hundred three million, eight hundred seventy-two thousand, eight hundred eighty-five".